Parramatta Web Fixes: Boost Your Sites Performance

 

"Web history" redirects here. For the feature of web browsers, see Web browsing history.

World Wide Web

The Web's former logo by Robert Cailliau
Inventor	Tim Berners-Lee
Inception	12 March 1989; 36 years ago (1989-03-12)

• v
• t
• e

History of computing
Hardware
Hardware 1960s to present
Software
Software Software configuration management Unix Free software and open-source software
Computer science
Artificial intelligence Compiler construction Early computer science Operating systems Programming languages Prominent pioneers Software engineering
Modern concepts
General-purpose CPUs Graphical user interface Internet Laptops Personal computers Video games World Wide Web Cloud Quantum
By country
Bulgaria Eastern Bloc Poland Romania South America Soviet Union Yugoslavia
Timeline of computing
before 1950 1950–1979 1980–1989 1990–1999 2000–2009 2010–2019 2020–present more timelines ...
Glossary of computer science
Category

The World Wide Web ("WWW", "W3" or simply "the Web") is a global information medium that users can access via computers connected to the Internet. The term is often mistakenly used as a synonym for the Internet, but the Web is a service that operates over the Internet, just as email and Usenet do. The history of the Internet and the history of hypertext date back significantly further than that of the World Wide Web.

Tim Berners-Lee invented the World Wide Web while working at CERN in 1989. He proposed a "universal linked information system" using several concepts and technologies, the most fundamental of which was the connections that existed between information.^[1][2] He developed the first web server, the first web browser, and a document formatting protocol, called Hypertext Markup Language (HTML). After publishing the markup language in 1991, and releasing the browser source code for public use in 1993, many other web browsers were soon developed, with Marc Andreessen's Mosaic (later Netscape Navigator) being particularly easy to use and install, and often credited with sparking the Internet boom of the 1990s. It was a graphical browser which ran on several popular office and home computers, bringing multimedia content to non-technical users by including images and text on the same page.

Websites for use by the general public began to emerge in 1993–94. This spurred competition in server and browser software, highlighted in the Browser wars which was initially dominated by Netscape Navigator and Internet Explorer. Following the complete removal of commercial restrictions on Internet use by 1995, commercialization of the Web amidst macroeconomic factors led to the dot-com boom and bust in the late 1990s and early 2000s.

The features of HTML evolved over time, leading to HTML version 2 in 1995, HTML3 and HTML4 in 1997, and HTML5 in 2014. The language was extended with advanced formatting in Cascading Style Sheets (CSS) and with programming capability by JavaScript. AJAX programming delivered dynamic content to users, which sparked a new era in Web design, styled Web 2.0. The use of social media, becoming commonplace in the 2010s, allowed users to compose multimedia content without programming skills, making the Web ubiquitous in everyday life.

Background

[edit]

The underlying concept of hypertext as a user interface paradigm originated in projects in the 1960s, from research such as the Hypertext Editing System (HES) by Andries van Dam at Brown University, IBM Generalized Markup Language, Ted Nelson's Project Xanadu, and Douglas Engelbart's oN-Line System (NLS).^{[3][page needed][non-primary source needed]} Both Nelson and Engelbart were in turn inspired by Vannevar Bush's microfilm-based memex, which was described in the 1945 essay "As We May Think".^{[4][title missing][5]} Other precursors were FRESS and Intermedia. Paul Otlet's project Mundaneum has also been named as an early 20th-century precursor of the Web.

In 1980, Tim Berners-Lee, at the European Organization for Nuclear Research (CERN) in Switzerland, built ENQUIRE, as a personal database of people and software models, but also as a way to experiment with hypertext; each new page of information in ENQUIRE had to be linked to another page.^[6][7][8] When Berners-Lee built ENQUIRE, the ideas developed by Bush, Engelbart, and Nelson did not influence his work, since he was not aware of them. However, as Berners-Lee began to refine his ideas, the work of these predecessors would later help to confirm the legitimacy of his concept.^[9][10]

During the 1980s, many packet-switched data networks emerged based on various communication protocols (see Protocol Wars). One of these standards was the Internet protocol suite, which is often referred to as TCP/IP. As the Internet grew through the 1980s, many people realized the increasing need to be able to find and organize files and use information. By 1985, the Domain Name System (upon which the Uniform Resource Locator is built) came into being.^{[11][better source needed][failed verification]} Many small, self-contained hypertext systems were created, such as Apple Computer's HyperCard (1987).

Berners-Lee's contract in 1980 was from June to December, but in 1984 he returned to CERN in a permanent role, and considered its problems of information management: physicists from around the world needed to share data, yet they lacked common machines and any shared presentation software. Shortly after Berners-Lee's return to CERN, TCP/IP protocols were installed on Unix machines at the institution, turning it into the largest Internet site in Europe. In 1988, the first direct IP connection between Europe and North America was established and Berners-Lee began to openly discuss the possibility of a web-like system at CERN.^[12] He was inspired by a book, Enquire Within upon Everything. Many online services existed before the creation of the World Wide Web, such as for example CompuServe, Usenet,^[13] Internet Relay Chat,^[14] Telnet^[15] and bulletin board systems.^[16] Before the internet, UUCP was used for online services such as e-mail,^[17] and BITNET was also another popular network.^[18]

While working at CERN, Tim Berners-Lee became frustrated with the inefficiencies and difficulties posed by finding information stored on different computers.^[19] On 12 March 1989, he submitted a memorandum, titled "Information Management: A Proposal",^[1][20] to the management at CERN. The proposal used the term "web" and was based on "a large hypertext database with typed links". It described a system called "Mesh" that referenced ENQUIRE, the database and software project he had built in 1980, with a more elaborate information management system based on links embedded as text: "Imagine, then, the references in this document all being associated with the network address of the thing to which they referred, so that while reading this document, you could skip to them with a click of the mouse." Such a system, he explained, could be referred to using one of the existing meanings of the word hypertext, a term that he says was coined in the 1950s. Berners-Lee notes the possibility of multimedia documents that include graphics, speech and video, which he terms hypermedia.^[1][2]

Although the proposal attracted little interest, Berners-Lee was encouraged by his manager, Mike Sendall, to begin implementing his system on a newly acquired NeXT workstation. He considered several names, including Information Mesh, The Information Mine or Mine of Information, but settled on World Wide Web. Berners-Lee found an enthusiastic supporter in his colleague and fellow hypertext enthusiast Robert Cailliau who began to promote the proposed system throughout CERN. Berners-Lee and Cailliau pitched Berners-Lee's ideas to the European Conference on Hypertext Technology in September 1990, but found no vendors who could appreciate his vision.

Berners-Lee's breakthrough was to marry hypertext to the Internet. In his book Weaving The Web, he explains that he had repeatedly suggested to members of both technical communities that a marriage between the two technologies was possible. But, when no one took up his invitation, he finally assumed the project himself. In the process, he developed three essential technologies:

• a system of globally unique identifiers for resources on the Web and elsewhere, the universal document identifier (UDI), later known as uniform resource locator (URL);
• the publishing language Hypertext Markup Language (HTML);
• the Hypertext Transfer Protocol (HTTP).^[21]

With help from Cailliau he published a more formal proposal on 12 November 1990 to build a "hypertext project" called WorldWideWeb (abbreviated "W3") as a "web" of "hypertext documents" to be viewed by "browsers" using a client–server architecture.^[22][23] The proposal was modelled after the Standard Generalized Markup Language (SGML) reader Dynatext by Electronic Book Technology, a spin-off from the Institute for Research in Information and Scholarship at Brown University. The Dynatext system, licensed by CERN, was considered too expensive and had an inappropriate licensing policy for use in the general high energy physics community, namely a fee for each document and each document alteration.^{[citation needed]}

At this point HTML and HTTP had already been in development for about two months and the first web server was about a month from completing its first successful test. Berners-Lee's proposal estimated that a read-only Web would be developed within three months and that it would take six months to achieve "the creation of new links and new material by readers, [so that] authorship becomes universal" as well as "the automatic notification of a reader when new material of interest to him/her has become available".

By December 1990, Berners-Lee and his work team had built all the tools necessary for a working Web: the HyperText Transfer Protocol (HTTP), the HyperText Markup Language (HTML), the first web browser (named WorldWideWeb, which was also a web editor), the first web server (later known as CERN httpd) and the first web site (https://info.cern.ch/) containing the first web pages that described the project itself was published on 20 December 1990.^[24][25] The browser could access Usenet newsgroups and FTP files as well. A NeXT Computer was used by Berners-Lee as the web server and also to write the web browser.^[26]

Working with Berners-Lee at CERN, Nicola Pellow developed the first cross-platform web browser, the Line Mode Browser.^[27]

In January 1991, the first web servers outside CERN were switched on. On 6 August 1991, Berners-Lee published a short summary of the World Wide Web project on the newsgroup alt.hypertext, inviting collaborators.^[28]

Paul Kunz from the Stanford Linear Accelerator Center (SLAC) visited CERN in September 1991, and was captivated by the Web. He brought the NeXT software back to SLAC, where librarian Louise Addis adapted it for the VM/CMS operating system on the IBM mainframe as a way to host the SPIRES-HEP database and display SLAC's catalog of online documents.^{[29][30][31][32]} This was the first web server outside of Europe and the first in North America.^[33]

The World Wide Web had several differences from other hypertext systems available at the time. The Web required only unidirectional links rather than bidirectional ones, making it possible for someone to link to another resource without action by the owner of that resource. It also significantly reduced the difficulty of implementing web servers and browsers (in comparison to earlier systems), but in turn, presented the chronic problem of link rot.

The WorldWideWeb browser only ran on NeXTSTEP operating system. This shortcoming was discussed in January 1992,^[34] and alleviated in April 1992 by the release of Erwise, an application developed at the Helsinki University of Technology, and in May by ViolaWWW, created by Pei-Yuan Wei, which included advanced features such as embedded graphics, scripting, and animation. ViolaWWW was originally an application for HyperCard.^[35] Both programs ran on the X Window System for Unix. In 1992, the first tests between browsers on different platforms were concluded successfully between buildings 513 and 31 in CERN, between browsers on the NexT station and the X11-ported Mosaic browser. ViolaWWW became the recommended browser at CERN. To encourage use within CERN, Bernd Pollermann put the CERN telephone directory on the web—previously users had to log onto the mainframe in order to look up phone numbers. The Web was successful at CERN and spread to other scientific and academic institutions.

Students at the University of Kansas adapted an existing text-only hypertext browser, Lynx, to access the web in 1992. Lynx was available on Unix and DOS, and some web designers, unimpressed with glossy graphical websites, held that a website not accessible through Lynx was not worth visiting.

In these earliest browsers, images opened in a separate "helper" application.

In the early 1990s, Internet-based projects such as Archie, Gopher, Wide Area Information Servers (WAIS), and the FTP Archive list attempted to create ways to organize distributed data. Gopher was a document browsing system for the Internet, released in 1991 by the University of Minnesota. Invented by Mark P. McCahill, it became the first commonly used hypertext interface to the Internet. While Gopher menu items were examples of hypertext, they were not commonly perceived in that way^{[clarification needed]}. In less than a year, there were hundreds of Gopher servers.^[36] It offered a viable alternative to the World Wide Web in the early 1990s and the consensus was that Gopher would be the primary way that people would interact with the Internet.^[37][38] However, in 1993, the University of Minnesota declared that Gopher was proprietary and would have to be licensed.^[36]

In response, on 30 April 1993, CERN announced that the World Wide Web would be free to anyone, with no fees due, and released their code into the public domain.^[39] This made it possible to develop servers and clients independently and to add extensions without licensing restrictions.^{[citation needed]} Coming two months after the announcement that the server implementation of the Gopher protocol was no longer free to use, this spurred the development of various browsers which precipitated a rapid shift away from Gopher.^[40] By releasing Berners-Lee's invention for public use, CERN encouraged and enabled its widespread use.^[41]

Early websites intermingled links for both the HTTP web protocol and the Gopher protocol, which provided access to content through hypertext menus presented as a file system rather than through HTML files. Early Web users would navigate either by bookmarking popular directory pages or by consulting updated lists such as the NCSA "What's New" page. Some sites were also indexed by WAIS, enabling users to submit full-text searches similar to the capability later provided by search engines.

After 1993 the World Wide Web saw many advances to indexing and ease of access through search engines, which often neglected Gopher and Gopherspace. As its popularity increased through ease of use, incentives for commercial investment in the Web also grew. By the middle of 1994, the Web was outcompeting Gopher and the other browsing systems for the Internet.^[42]

The National Center for Supercomputing Applications (NCSA) at the University of Illinois at Urbana–Champaign (UIUC) established a website in November 1992. After Marc Andreessen, a student at UIUC, was shown ViolaWWW in late 1992,^[35] he began work on Mosaic with another UIUC student Eric Bina, using funding from the High-Performance Computing and Communications Initiative, a US-federal research and development program initiated by US Senator Al Gore.^[43][44][45] Andreessen and Bina released a Unix version of the browser in February 1993; Mac and Windows versions followed in August 1993. The browser gained popularity due to its strong support of integrated multimedia, and the authors' rapid response to user bug reports and recommendations for new features.^[35] Historians generally agree that the 1993 introduction of the Mosaic web browser was a turning point for the World Wide Web.^[46][47][48]

Before the release of Mosaic in 1993, graphics were not commonly mixed with text in web pages, and the Web was less popular than older protocols such as Gopher and WAIS. Mosaic could display inline images^[49] and submit forms^[50][51] for Windows, Macintosh and X-Windows. NCSA also developed HTTPd, a Unix web server that used the Common Gateway Interface to process forms and Server Side Includes for dynamic content. Both the client and server were free to use with no restrictions.^[52] Mosaic was an immediate hit;^[53] its graphical user interface allowed the Web to become by far the most popular protocol on the Internet. Within a year, web traffic surpassed Gopher's.^[36] Wired declared that Mosaic made non-Internet online services obsolete,^[54] and the Web became the preferred interface for accessing the Internet.^{[citation needed]}

The World Wide Web enabled the spread of information over the Internet through an easy-to-use and flexible format. It thus played an important role in popularising use of the Internet.^[55] Although the two terms are sometimes conflated in popular use, World Wide Web is not synonymous with Internet.^[56] The Web is an information space containing hyperlinked documents and other resources, identified by their URIs.^[57] It is implemented as both client and server software using Internet protocols such as TCP/IP and HTTP.

In keeping with its origins at CERN, early adopters of the Web were primarily university-based scientific departments or physics laboratories such as SLAC and Fermilab. By January 1993 there were fifty web servers across the world.^[58] By October 1993 there were over five hundred servers online, including some notable websites.^[59]

Practical media distribution and streaming media over the Web was made possible by advances in data compression, due to the impractically high bandwidth requirements of uncompressed media. Following the introduction of the Web, several media formats based on discrete cosine transform (DCT) were introduced for practical media distribution and streaming over the Web, including the MPEG video format in 1991 and the JPEG image format in 1992. The high level of image compression made JPEG a good format for compensating slow Internet access speeds, typical in the age of dial-up Internet access. JPEG became the most widely used image format for the World Wide Web. A DCT variation, the modified discrete cosine transform (MDCT) algorithm, led to the development of MP3, which was introduced in 1991 and became the first popular audio format on the Web.

In 1992 the Computing and Networking Department of CERN, headed by David Williams, withdrew support of Berners-Lee's work. A two-page email sent by Williams stated that the work of Berners-Lee, with the goal of creating a facility to exchange information such as results and comments from CERN experiments to the scientific community, was not the core activity of CERN and was a misallocation of CERN's IT resources. Following this decision, Tim Berners-Lee left CERN for the Massachusetts Institute of Technology (MIT), where he continued to develop HTTP.^{[citation needed]}

The first Microsoft Windows browser was Cello, written by Thomas R. Bruce for the Legal Information Institute at Cornell Law School to provide legal information, since access to Windows was more widespread amongst lawyers than access to Unix. Cello was released in June 1993.

The rate of web site deployment increased sharply around the world, and fostered development of international standards for protocols and content formatting.^[60] Berners-Lee continued to stay involved in guiding web standards, such as the markup languages to compose web pages, and he advocated his vision of a Semantic Web (sometimes known as Web 3.0) based around machine-readability and interoperability standards.

In May 1994, the first International WWW Conference, organized by Robert Cailliau, was held at CERN; the conference has been held every year since.

The World Wide Web Consortium (W3C) was founded by Tim Berners-Lee after he left the European Organization for Nuclear Research (CERN) in September/October 1994 in order to create open standards for the Web.^[61] It was founded at the Massachusetts Institute of Technology Laboratory for Computer Science (MIT/LCS) with support from the Defense Advanced Research Projects Agency (DARPA), which had pioneered the Internet. A year later, a second site was founded at INRIA (a French national computer research lab) with support from the European Commission; and in 1996, a third continental site was created in Japan at Keio University.

W3C comprised various companies that were willing to create standards and recommendations to improve the quality of the Web. Berners-Lee made the Web available freely, with no patent and no royalties due. The W3C decided that its standards must be based on royalty-free technology, so they can be easily adopted by anyone. Netscape and Microsoft, in the middle of a browser war, ignored the W3C and added elements to HTML ad hoc (e.g., blink and marquee). Finally, in 1995, Netscape and Microsoft came to their senses and agreed to abide by the W3C's standard.^[62]

The W3C published the standard for HTML 4 in 1997, which included Cascading Style Sheets (CSS), giving designers more control over the appearance of web pages without the need for additional HTML tags. The W3C could not enforce compliance so none of the browsers were fully compliant. This frustrated web designers who formed the Web Standards Project (WaSP) in 1998 with the goal of cajoling compliance with standards.^[63] A List Apart and CSS Zen Garden were influential websites that promoted good design and adherence to standards.^[64] Nevertheless, AOL halted development of Netscape^[65] and Microsoft was slow to update IE.^[66] Mozilla and Apple both released browsers that aimed to be more standards compliant (Firefox and Safari), but were unable to dislodge IE as the dominant browser.

As the Web grew in the mid-1990s, web directories and primitive search engines were created to index pages and allow people to find things. Commercial use restrictions on the Internet were lifted in 1995 when NSFNET was shut down.

In the US, the online service America Online (AOL) offered their users a connection to the Internet via their own internal browser, using a dial-up Internet connection. In January 1994, Yahoo! was founded by Jerry Yang and David Filo, then students at Stanford University. Yahoo! Directory became the first popular web directory. Yahoo! Search, launched the same year, was the first popular search engine on the World Wide Web. Yahoo! became the quintessential example of a first mover on the Web.

Online shopping began to emerge with the launch of Amazon's shopping site by Jeff Bezos in 1995 and eBay by Pierre Omidyar the same year.

By 1994, Marc Andreessen's Netscape Navigator superseded Mosaic in popularity, holding the position for some time. Bill Gates outlined Microsoft's strategy to dominate the Internet in his Tidal Wave memo in 1995.^[67] With the release of Windows 95 and the popular Internet Explorer browser, many public companies began to develop a Web presence. At first, people mainly anticipated the possibilities of free publishing and instant worldwide information. By the late 1990s, the directory model had given way to search engines, corresponding with the rise of Google Search, which developed new approaches to relevancy ranking. Directory features, while still commonly available, became after-thoughts to search engines.

Netscape had a very successful IPO valuing the company at $2.9 billion despite the lack of profits and triggering the dot-com bubble.^[68] Increasing familiarity with the Web led to the growth of direct Web-based commerce (e-commerce) and instantaneous group communications worldwide. Many dot-com companies, displaying products on hypertext webpages, were added into the Web. Over the next 5 years, over a trillion dollars was raised to fund thousands of startups consisting of little more than a website.

During the dot-com boom, many companies vied to create a dominant web portal in the belief that such a website would best be able to attract a large audience that in turn would attract online advertising revenue. While most of these portals offered a search engine, they were not interested in encouraging users to find other websites and leave the portal and instead concentrated on "sticky" content.^[69] In contrast, Google was a stripped-down search engine that delivered superior results.^[70] It was a hit with users who switched from portals to Google. Furthermore, with AdWords, Google had an effective business model.^[71][72]

AOL bought Netscape in 1998.^[73] In spite of their early success, Netscape was unable to fend off Microsoft.^[74] Internet Explorer and a variety of other browsers almost completely replaced it.

Faster broadband internet connections replaced many dial-up connections from the beginning of the 2000s.

With the bursting of the dot-com bubble, many web portals either scaled back operations, floundered,^[75] or shut down entirely.^[76][77][78] AOL disbanded Netscape in 2003.^[79]

Web server software was developed to allow computers to act as web servers. The first web servers supported only static files, such as HTML (and images), but now they commonly allow embedding of server side applications. Web framework software enabled building and deploying web applications. Content management systems (CMS) were developed to organize and facilitate collaborative content creation. Many of them were built on top of separate content management frameworks.

After Robert McCool joined Netscape, development on the NCSA HTTPd server languished. In 1995, Brian Behlendorf and Cliff Skolnick created a mailing list to coordinate efforts to fix bugs and make improvements to HTTPd.^[80] They called their version of HTTPd, Apache.^[81] Apache quickly became the dominant server on the Web.^[82] After adding support for modules, Apache was able to allow developers to handle web requests with a variety of languages including Perl, PHP and Python. Together with Linux and MySQL, it became known as the LAMP platform.

Following the success of Apache, the Apache Software Foundation was founded in 1999 and produced many open source web software projects in the same collaborative spirit.

After graduating from UIUC, Andreessen and Jim Clark, former CEO of Silicon Graphics, met and formed Mosaic Communications Corporation in April 1994 to develop the Mosaic Netscape browser commercially. The company later changed its name to Netscape, and the browser was developed further as Netscape Navigator, which soon became the dominant web client. They also released the Netsite Commerce web server which could handle SSL requests, thus enabling e-commerce on the Web.^[83] SSL became the standard method to encrypt web traffic. Navigator 1.0 also introduced cookies, but Netscape did not publicize this feature. Netscape followed up with Navigator 2 in 1995 introducing frames, Java applets and JavaScript. In 1998, Netscape made Navigator open source and launched Mozilla.^[84]

Microsoft licensed Mosaic from Spyglass and released Internet Explorer 1.0 that year and IE2 later the same year. IE2 added features pioneered at Netscape such as cookies, SSL, and JavaScript. The browser wars became a competition for dominance when Explorer was bundled with Windows.^[85][86] This led to the United States v. Microsoft Corporation antitrust lawsuit.

IE3, released in 1996, added support for Java applets, ActiveX, and CSS. At this point, Microsoft began bundling IE with Windows. IE3 managed to increase Microsoft's share of the browser market from under 10% to over 20%.^[87] IE4, released the following year, introduced Dynamic HTML setting the stage for the Web 2.0 revolution. By 1998, IE was able to capture the majority of the desktop browser market.^[74] It would be the dominant browser for the next fourteen years.

Google released their Chrome browser in 2008 with the first JIT JavaScript engine, V8. Chrome overtook IE to become the dominant desktop browser in four years,^[88] and overtook Safari to become the dominant mobile browser in two.^[89] At the same time, Google open sourced Chrome's codebase as Chromium.^[90]

Ryan Dahl used Chromium's V8 engine in 2009 to power an event driven runtime system, Node.js, which allowed JavaScript code to be used on servers as well as browsers. This led to the development of new software stacks such as MEAN. Thanks to frameworks such as Electron, developers can bundle up node applications as standalone desktop applications such as Slack.

Acer and Samsung began selling Chromebooks, cheap laptops running ChromeOS capable of running web apps, in 2011. Over the next decade, more companies offered Chromebooks. Chromebooks outsold MacOS devices in 2020 to become the second most popular OS in the world.^[91]

Other notable web browsers emerged including Mozilla's Firefox, Opera's Opera browser and Apple's Safari.

Web 1.0 is a retronym referring to the first stage of the World Wide Web's evolution, from roughly 1989 to 2004. According to Graham Cormode and Balachander Krishnamurthy, "content creators were few in Web 1.0 with the vast majority of users simply acting as consumers of content".^[92] Personal web pages were common, consisting mainly of static pages hosted on ISP-run web servers, or on free web hosting services such as Tripod and the now-defunct GeoCities.^[93][94]

Some common design elements of a Web 1.0 site include:^[95]

• Static pages rather than dynamic HTML.^[96]
• Content provided from the server's filesystem rather than a relational database management system (RDBMS).
• Pages built using Server Side Includes or Common Gateway Interface (CGI) instead of a web application written in a dynamic programming language which allows the contents of the page to be modified such as Perl, PHP, Python, Ruby, solutions such as ASP.NET, JSP or node.js.
• The use of HTML 3.2-era elements such as frames and tables to position and align elements on a page. These were often used in combination with spacer GIFs. Frames are web pages embedded into other web pages, and spacer GIFs were transparent images used to force the content in the page to be displayed a certain way.
• Proprietary HTML extensions, such as the <blink> and <marquee> tags, introduced during the first browser war.
• Online guestbooks.
• GIF buttons, graphics (typically 88×31 pixels in size) promoting web browsers, operating systems, text editors and various other products.
• HTML forms sent via email. Support for server side scripting was rare on shared servers during this period. To provide a feedback mechanism for web site visitors, mailto forms were used. A user would fill in a form, and upon clicking the form's submit button, their email client would launch and attempt to send an email containing the form's details. The popularity and complications of the mailto protocol led browser developers to incorporate email clients into their browsers.^[97]

Terry Flew, in his third edition of New Media, described the differences between Web 1.0 and Web 2.0 as a

"move from personal websites to blogs and blog site aggregation, from publishing to participation, from web content as the outcome of large up-front investment to an ongoing and interactive process, and from content management systems to links based on "tagging" website content using keywords (folksonomy)."

Flew believed these factors formed the trends that resulted in the onset of the Web 2.0 "craze".^[98]

Web pages were initially conceived as structured documents based upon HTML. They could include images, video, and other content, although the use of media was initially relatively limited and the content was mainly static. By the mid-2000s, new approaches to sharing and exchanging content, such as blogs and RSS, rapidly gained acceptance on the Web. The video-sharing website YouTube launched the concept of user-generated content.^[99] As new technologies made it easier to create websites that behaved dynamically, the Web attained greater ease of use and gained a sense of interactivity which ushered in a period of rapid popularization. This new era also brought into existence social networking websites, such as Friendster, MySpace, Facebook, and Twitter, and photo- and video-sharing websites such as Flickr and, later, Instagram which gained users rapidly and became a central part of youth culture. Wikipedia's user-edited content quickly displaced the professionally-written Microsoft Encarta.^[100] The popularity of these sites, combined with developments in the technology that enabled them, and the increasing availability and affordability of high-speed connections made video content far more common on all kinds of websites. This new media-rich model for information exchange, featuring user-generated and user-edited websites, was dubbed Web 2.0, a term coined in 1999 by Darcy DiNucci^[101] and popularized in 2004 at the Web 2.0 Conference. The Web 2.0 boom drew investment from companies worldwide and saw many new service-oriented startups catering to a newly "democratized" Web.^{[102][103][104][105][106][107]}

JavaScript made the development of interactive web applications possible. Web pages could run JavaScript and respond to user input, but they could not interact with the network. Browsers could submit data to servers via forms and receive new pages, but this was slow compared to traditional desktop applications. Developers that wanted to offer sophisticated applications over the Web used Java or nonstandard solutions such as Adobe Flash or Microsoft's ActiveX.

Microsoft added a little-noticed feature called XMLHttpRequest to Internet Explorer in 1999, which enabled a web page to communicate with the server while remaining visible. Developers at Oddpost used this feature in 2002 to create the first Ajax application, a webmail client that performed as well as a desktop application.^[108] Ajax apps were revolutionary. Web pages evolved beyond static documents to full-blown applications. Websites began offering APIs in addition to webpages. Developers created a plethora of Ajax apps including widgets, mashups and new types of social apps. Analysts called it Web 2.0.^[109]

Browser vendors improved the performance of their JavaScript engines^[110] and dropped support for Flash and Java.^[111][112] Traditional client server applications were replaced by cloud apps. Amazon reinvented itself as a cloud service provider.

The use of social media on the Web has become ubiquitous in everyday life.^[113][114] The 2010s also saw the rise of streaming services, such as Netflix.

In spite of the success of Web 2.0 applications, the W3C forged ahead with their plan to replace HTML with XHTML and represent all data in XML. In 2004, representatives from Mozilla, Opera, and Apple formed an opposing group, the Web Hypertext Application Technology Working Group (WHATWG), dedicated to improving HTML while maintaining backward compatibility.^[115] For the next several years, websites did not transition their content to XHTML; browser vendors did not adopt XHTML2; and developers eschewed XML in favor of JSON.^[116] By 2007, the W3C conceded and announced they were restarting work on HTML^[117] and in 2009, they officially abandoned XHTML.^[118] In 2019, the W3C ceded control of the HTML specification, now called the HTML Living Standard, to WHATWG.^[119]

Microsoft rewrote their Edge browser in 2021 to use Chromium as its code base in order to be more compatible with Chrome.^[120]

The increasing use of encrypted connections (HTTPS) enabled e-commerce and online banking. Nonetheless, the 2010s saw the emergence of various controversial trends, such as internet censorship and the growth of cybercrime, including web-based cyberattacks and ransomware.^[121][122]

Early attempts to allow wireless devices to access the Web used simplified formats such as i-mode and WAP. Apple introduced the first smartphone in 2007 with a full-featured browser. Other companies followed suit and in 2011, smartphone sales overtook PCs.^[123] Since 2016, most visitors access websites with mobile devices^[124] which led to the adoption of responsive web design.

Apple, Mozilla, and Google have taken different approaches to integrating smartphones with modern web apps. Apple initially promoted web apps for the iPhone, but then encouraged developers to make native apps.^[125] Mozilla announced Web APIs in 2011 to allow webapps to access hardware features such as audio, camera or GPS.^[126] Frameworks such as Cordova and Ionic allow developers to build hybrid apps. Mozilla released a mobile OS designed to run web apps in 2012,^[127] but discontinued it in 2015.^[128]

Google announced specifications for Accelerated Mobile Pages (AMP),^[129] and progressive web applications (PWA) in 2015.^[130] AMPs use a combination of HTML, JavaScript, and Web Components to optimize web pages for mobile devices; and PWAs are web pages that, with a combination of web workers and manifest files, can be saved to a mobile device and opened like a native app.

The extension of the Web to facilitate data exchange was explored as an approach to create a Semantic Web (sometimes called Web 3.0). This involved using machine-readable information and interoperability standards to enable context-understanding programs to intelligently select information for users.^[131] Continued extension of the Web has focused on connecting devices to the Internet, coined Intelligent Device Management. As Internet connectivity becomes ubiquitous, manufacturers have started to leverage the expanded computing power of their devices to enhance their usability and capability. Through Internet connectivity, manufacturers are now able to interact with the devices they have sold and shipped to their customers, and customers are able to interact with the manufacturer (and other providers) to access a lot of new content.^[132]

This phenomenon has led to the rise of the Internet of Things (IoT),^[133] where modern devices are connected through sensors, software, and other technologies that exchange information with other devices and systems on the Internet. This creates an environment where data can be collected and analyzed instantly, providing better insights and improving the decision-making process. Additionally, the integration of AI with IoT devices continues to improve their capabilities, allowing them to predict customer needs and perform tasks, increasing efficiency and user satisfaction.

Web3 (sometimes also referred to as Web 3.0) is an idea for a decentralized Web based on public blockchains, smart contracts, digital tokens and digital wallets.^[134]

The next generation of the Web is often termed Web 4.0, but its definition is not clear. According to some sources, it is a Web that involves artificial intelligence,^[135] the internet of things, pervasive computing, ubiquitous computing and the Web of Things among other concepts.^[136] According to the European Union, Web 4.0 is "the expected fourth generation of the World Wide Web. Using advanced artificial and ambient intelligence, the internet of things, trusted blockchain transactions, virtual worlds and XR capabilities, digital and real objects and environments are fully integrated and communicate with each other, enabling truly intuitive, immersive experiences, seamlessly blending the physical and digital worlds".^[137]

Historiography of the Web poses specific challenges, including disposable data, missing links, lost content and archived websites, which have consequences for web historians. Sites such as the Internet Archive aim to preserve content.^[138][139]

• Fediverse
• History of email
• History of hypertext
• History of the Internet
• History of telecommunication
• History of web syndication technology
• List of websites founded before 1995
• Webring

• Minitel
• NABU Network
• Quantum Link / AOL
• CompuServe
• GEnie
• Usenet
• Bulletin board system
• Prestel
• Scrapbook
• Category:Pre–World Wide Web online services

• Berners-Lee, Tim; Fischetti, Mark (1999). Weaving the Web : the original design and ultimate destiny of the World Wide Web by its inventor. San Francisco: HarperSanFrancisco. ISBN 0-06-251586-1. OCLC 41238513.
• Brügger, Niels (2017). Web 25 : histories from the first 25 years of the World Wide Web. New York, NY. ISBN 978-1-4331-3269-8. OCLC 976036138.cite book: CS1 maint: location missing publisher (link)
• Gillies, James; Cailliau, Robert (2000). How the Web was born : the story of the World Wide Web. Oxford: Oxford University Press. ISBN 0-19-286207-3. OCLC 43377073.
• Herman, Andrew; Swiss, Thomas (2000). The World Wide Web and contemporary cultural theory. New York: Routledge. ISBN 0-415-92501-0. OCLC 44446371.
• Schafer, Valérie; Thierry, Benjamin G. (2018). "The 90s as a turning decade for Internet and the Web". Internet Histories. 2 (3–4): 225–229. doi:10.1080/24701475.2018.1521060.
• Naughton, John (2016). "The evolution of the Internet: from military experiment to General Purpose Technology". Journal of Cyber Policy. 1 (1): 5–28. doi:10.1080/23738871.2016.1157619.

• Web History: first 30 years
• "A Little History of the World Wide Web: from 1945 to 1995", Dan Connolly, W3C, 2000
• "The World Wide Web: Past, Present and Future", Tim Berners-Lee, August 1996
• The History of the Web
• Web Development History
• A Brief(ish) History of the Web Universe, Brian Kardell
• Web History Community Group, W3C
• The history of the Web, W3C
• info.cern.ch, the first website

Websites that use technology beyond the static pages of the early Internet

Web 2.0 (also known as participative (or participatory)^[1] web and social web)^[2] refers to websites that emphasize user-generated content, ease of use, participatory culture, and interoperability (i.e., compatibility with other products, systems, and devices) for end users.

The term was coined by Darcy DiNucci in 1999^[3] and later popularized by Tim O'Reilly and Dale Dougherty at the first Web 2.0 Conference in 2004.^[4][5][6] Although the term mimics the numbering of software versions, it does not denote a formal change in the nature of the World Wide Web;^[7] the term merely describes a general change that occurred during this period as interactive websites proliferated and came to overshadow the older, more static websites of the original Web.^[2]

A Web 2.0 website allows users to interact and collaborate through social media dialogue as creators of user-generated content in a virtual community. This contrasts the first generation of Web 1.0-era websites where people were limited to passively viewing content. Examples of Web 2.0 features include social networking sites or social media sites (e.g., Facebook), blogs, wikis, folksonomies ("tagging" keywords on websites and links), video sharing sites (e.g., YouTube), image sharing sites (e.g., Flickr), hosted services, Web applications ("apps"), collaborative consumption platforms, and mashup applications.

Whether Web 2.0 is substantially different from prior Web technologies has been challenged by World Wide Web inventor Tim Berners-Lee, who describes the term as jargon.^[8] His original vision of the Web was "a collaborative medium, a place where we [could] all meet and read and write".^[9][10] On the other hand, the term Semantic Web (sometimes referred to as Web 3.0)^[11] was coined by Berners-Lee to refer to a web of content where the meaning can be processed by machines.^[12]

History

[edit]

Main article: History of the World Wide Web

Web 1.0

[edit]

Web 1.0 is a retronym referring to the first stage of the World Wide Web's evolution, from roughly 1989 to 2004. According to Graham Cormode and Balachander Krishnamurthy, "content creators were few in Web 1.0 with the vast majority of users simply acting as consumers of content".^[13] Personal web pages were common, consisting mainly of static pages hosted on ISP-run web servers, or on free web hosting services such as Tripod and the now-defunct GeoCities.^[14][15] With Web 2.0, it became common for average web users to have social-networking profiles (on sites such as Myspace and Facebook) and personal blogs (sites like Blogger, Tumblr and LiveJournal) through either a low-cost web hosting service or through a dedicated host. In general, content was generated dynamically, allowing readers to comment directly on pages in a way that was not common previously.^{[citation needed]}

Some Web 2.0 capabilities were present in the days of Web 1.0, but were implemented differently. For example, a Web 1.0 site may have had a guestbook page for visitor comments, instead of a comment section at the end of each page (typical of Web 2.0). During Web 1.0, server performance and bandwidth had to be considered—lengthy comment threads on multiple pages could potentially slow down an entire site. Terry Flew, in his third edition of New Media, described the differences between Web 1.0 and Web 2.0 as a

"move from personal websites to blogs and blog site aggregation, from publishing to participation, from web content as the outcome of large up-front investment to an ongoing and interactive process, and from content management systems to links based on "tagging" website content using keywords (folksonomy)."

Flew believed these factors formed the trends that resulted in the onset of the Web 2.0 "craze".^[16]

Characteristics

[edit]

Some common design elements of a Web 1.0 site include:^[17]

• Static pages rather than dynamic HTML.^[18]
• Content provided from the server's filesystem rather than a relational database management system (RDBMS).
• Pages built using Server Side Includes or Common Gateway Interface (CGI) instead of a web application written in a dynamic programming language such as Perl, PHP, Python or Ruby.^{[clarification needed]}
• The use of HTML 3.2-era elements such as frames and tables to position and align elements on a page. These were often used in combination with spacer GIFs.^{[citation needed]}
• Proprietary HTML extensions, such as the <blink> and <marquee> tags, introduced during the first browser war.
• Online guestbooks.
• GIF buttons, graphics (typically 88×31 pixels in size) promoting web browsers, operating systems, text editors and various other products.
• HTML forms sent via email. Support for server side scripting was rare on shared servers during this period. To provide a feedback mechanism for web site visitors, mailto forms were used. A user would fill in a form, and upon clicking the form's submit button, their email client would launch and attempt to send an email containing the form's details. The popularity and complications of the mailto protocol led browser developers to incorporate email clients into their browsers.^[19]

Web 2.0

[edit]

The term "Web 2.0" was coined by Darcy DiNucci, an information architecture consultant, in her January 1999 article "Fragmented Future":^[3][20]

"The Web we know now, which loads into a browser window in essentially static screenfuls, is only an embryo of the Web to come. The first glimmerings of Web 2.0 are beginning to appear, and we are just starting to see how that embryo might develop. The Web will be understood not as screenfuls of text and graphics but as a transport mechanism, the ether through which interactivity happens. It will [...] appear on your computer screen, [...] on your TV set [...] your car dashboard [...] your cell phone [...] hand-held game machines [...] maybe even your microwave oven."

Writing when Palm Inc. introduced its first web-capable personal digital assistant (supporting Web access with WAP), DiNucci saw the Web "fragmenting" into a future that extended beyond the browser/PC combination it was identified with. She focused on how the basic information structure and hyper-linking mechanism introduced by HTTP would be used by a variety of devices and platforms. As such, her "2.0" designation refers to the next version of the Web that does not directly relate to the term's current use.

The term Web 2.0 did not resurface until 2002.^[21][22][23] Companies such as Amazon, Facebook, Twitter, and Google, made it easy to connect and engage in online transactions. Web 2.0 introduced new features, such as multimedia content and interactive web applications, which mainly consisted of two-dimensional screens.^[24] Kinsley and Eric focus on the concepts currently associated with the term where, as Scott Dietzen puts it, "the Web becomes a universal, standards-based integration platform".^[23] In 2004, the term began to popularize when O'Reilly Media and MediaLive hosted the first Web 2.0 conference. In their opening remarks, John Battelle and Tim O'Reilly outlined their definition of the "Web as Platform", where software applications are built upon the Web as opposed to upon the desktop. The unique aspect of this migration, they argued, is that "customers are building your business for you".^[25] They argued that the activities of users generating content (in the form of ideas, text, videos, or pictures) could be "harnessed" to create value. O'Reilly and Battelle contrasted Web 2.0 with what they called "Web 1.0". They associated this term with the business models of Netscape and the Encyclopædia Britannica Online. For example,

"Netscape framed 'the web as platform' in terms of the old software paradigm: their flagship product was the web browser, a desktop application, and their strategy was to use their dominance in the browser market to establish a market for high-priced server products. Control over standards for displaying content and applications in the browser would, in theory, give Netscape the kind of market power enjoyed by Microsoft in the PC market. Much like the 'horseless carriage' framed the automobile as an extension of the familiar, Netscape promoted a 'webtop' to replace the desktop, and planned to populate that webtop with information updates and applets pushed to the webtop by information providers who would purchase Netscape servers.^[26]"

In short, Netscape focused on creating software, releasing updates and bug fixes, and distributing it to the end users. O'Reilly contrasted this with Google, a company that did not, at the time, focus on producing end-user software, but instead on providing a service based on data, such as the links that Web page authors make between sites. Google exploits this user-generated content to offer Web searches based on reputation through its "PageRank" algorithm. Unlike software, which undergoes scheduled releases, such services are constantly updated, a process called "the perpetual beta". A similar difference can be seen between the Encyclopædia Britannica Online and Wikipedia – while the Britannica relies upon experts to write articles and release them periodically in publications, Wikipedia relies on trust in (sometimes anonymous) community members to constantly write and edit content. Wikipedia editors are not required to have educational credentials, such as degrees, in the subjects in which they are editing. Wikipedia is not based on subject-matter expertise, but rather on an adaptation of the open source software adage "given enough eyeballs, all bugs are shallow". This maxim is stating that if enough users are able to look at a software product's code (or a website), then these users will be able to fix any "bugs" or other problems. The Wikipedia volunteer editor community produces, edits, and updates articles constantly. Web 2.0 conferences have been held every year since 2004, attracting entrepreneurs, representatives from large companies, tech experts and technology reporters.

The popularity of Web 2.0 was acknowledged by 2006 TIME magazine Person of The Year (You).^[27] That is, TIME selected the masses of users who were participating in content creation on social networks, blogs, wikis, and media sharing sites.

In the cover story, Lev Grossman explains:

"It's a story about community and collaboration on a scale never seen before. It's about the cosmic compendium of knowledge Wikipedia and the million-channel people's network YouTube and the online metropolis MySpace. It's about the many wresting power from the few and helping one another for nothing and how that will not only change the world but also change the way the world changes."

Instead of merely reading a Web 2.0 site, a user is invited to contribute to the site's content by commenting on published articles, or creating a user account] or profile on the site, which may enable increased participation. By increasing emphasis on these already-extant capabilities, they encourage users to rely more on their browser for user interface, application software ("apps") and file storage facilities. This has been called "network as platform" computing.^[5] Major features of Web 2.0 include social networking websites, self-publishing platforms (e.g., WordPress' easy-to-use blog and website creation tools), "tagging" (which enables users to label websites, videos or photos in some fashion), "like" buttons (which enable a user to indicate that they are pleased by online content), and social bookmarking.

Users can provide the data and exercise some control over what they share on a Web 2.0 site.^[5][28] These sites may have an "architecture of participation" that encourages users to add value to the application as they use it.^[4][5] Users can add value in many ways, such as uploading their own content on blogs, consumer-evaluation platforms (e.g. Amazon and eBay), news websites (e.g. responding in the comment section), social networking services, media-sharing websites (e.g. YouTube and Instagram) and collaborative-writing projects.^[29] Some scholars argue that cloud computing is an example of Web 2.0 because it is simply an implication of computing on the Internet.^[30]

Web 2.0 offers almost all users the same freedom to contribute,^[31] which can lead to effects that are varyingly perceived as productive by members of a given community or not, which can lead to emotional distress and disagreement. The impossibility of excluding group members who do not contribute to the provision of goods (i.e., to the creation of a user-generated website) from sharing the benefits (of using the website) gives rise to the possibility that serious members will prefer to withhold their contribution of effort and "free ride" on the contributions of others.^[32] This requires what is sometimes called radical trust by the management of the Web site.

Encyclopaedia Britannica calls Wikipedia "the epitome of the so-called Web 2.0" and describes what many view as the ideal of a Web 2.0 platform as "an egalitarian environment where the web of social software enmeshes users in both their real and virtual-reality workplaces."^[33]

According to Best,^[34] the characteristics of Web 2.0 are rich user experience, user participation, dynamic content, metadata, Web standards, and scalability. Further characteristics, such as openness, freedom,^[35] and collective intelligence^[36] by way of user participation, can also be viewed as essential attributes of Web 2.0. Some websites require users to contribute user-generated content to have access to the website, to discourage "free riding".

The key features of Web 2.0 include:^{[citation needed]}

1. Folksonomy – free classification of information; allows users to collectively classify and find information (e.g. "tagging" of websites, images, videos or links)
2. Rich user experience – dynamic content that is responsive to user input (e.g., a user can "click" on an image to enlarge it or find out more information)
3. User participation – information flows two ways between the site owner and site users by means of evaluation, review, and online commenting. Site users also typically create user-generated content for others to see (e.g., Wikipedia, an online encyclopedia that anyone can write articles for or edit)
4. Software as a service (SaaS) – Web 2.0 sites developed APIs to allow automated usage, such as by a Web "app" (software application) or a mashup
5. Mass participation – near-universal web access leads to differentiation of concerns, from the traditional Internet user base (who tended to be hackers and computer hobbyists) to a wider variety of users, drastically changing the audience of internet users.

The client-side (Web browser) technologies used in Web 2.0 development include Ajax and JavaScript frameworks. Ajax programming uses JavaScript and the Document Object Model (DOM) to update selected regions of the page area without undergoing a full page reload. To allow users to continue interacting with the page, communications such as data requests going to the server are separated from data coming back to the page (asynchronously).

Otherwise, the user would have to routinely wait for the data to come back before they can do anything else on that page, just as a user has to wait for a page to complete the reload. This also increases the overall performance of the site, as the sending of requests can complete quicker independent of blocking and queueing required to send data back to the client. The data fetched by an Ajax request is typically formatted in XML or JSON (JavaScript Object Notation) format, two widely used structured data formats. Since both of these formats are natively understood by JavaScript, a programmer can easily use them to transmit structured data in their Web application.

When this data is received via Ajax, the JavaScript program then uses the Document Object Model to dynamically update the Web page based on the new data, allowing for rapid and interactive user experience. In short, using these techniques, web designers can make their pages function like desktop applications. For example, Google Docs uses this technique to create a Web-based word processor.

As a widely available plug-in independent of W3C standards (the World Wide Web Consortium is the governing body of Web standards and protocols), Adobe Flash was capable of doing many things that were not possible pre-HTML5. Of Flash's many capabilities, the most commonly used was its ability to integrate streaming multimedia into HTML pages. With the introduction of HTML5 in 2010 and the growing concerns with Flash's security, the role of Flash became obsolete, with browser support ending on December 31, 2020.

In addition to Flash and Ajax, JavaScript/Ajax frameworks have recently become a very popular means of creating Web 2.0 sites. At their core, these frameworks use the same technology as JavaScript, Ajax, and the DOM. However, frameworks smooth over inconsistencies between Web browsers and extend the functionality available to developers. Many of them also come with customizable, prefabricated 'widgets' that accomplish such common tasks as picking a date from a calendar, displaying a data chart, or making a tabbed panel.

On the server-side, Web 2.0 uses many of the same technologies as Web 1.0. Languages such as Perl, PHP, Python, Ruby, as well as Enterprise Java (J2EE) and Microsoft.NET Framework, are used by developers to output data dynamically using information from files and databases. This allows websites and web services to share machine readable formats such as XML (Atom, RSS, etc.) and JSON. When data is available in one of these formats, another website can use it to integrate a portion of that site's functionality.

Web 2.0 can be described in three parts:

• Rich web application – defines the experience brought from desktop to browser, whether it is "rich" from a graphical point of view or a usability/interactivity or features point of view.^{[contradictory]}
• Web-oriented architecture (WOA) – defines how Web 2.0 applications expose their functionality so that other applications can leverage and integrate the functionality providing a set of much richer applications. Examples are feeds, RSS feeds, web services, mashups.
• Social Web – defines how Web 2.0 websites tend to interact much more with the end user and make the end user an integral part of the website, either by adding his or her profile, adding comments on content, uploading new content, or adding user-generated content (e.g., personal digital photos).

As such, Web 2.0 draws together the capabilities of client- and server-side software, content syndication and the use of network protocols. Standards-oriented Web browsers may use plug-ins and software extensions to handle the content and user interactions. Web 2.0 sites provide users with information storage, creation, and dissemination capabilities that were not possible in the environment known as "Web 1.0".

Web 2.0 sites include the following features and techniques, referred to as the acronym SLATES by Andrew McAfee:^[37]

Search

Finding information through keyword search.

Links to other websites

Connects information sources together using the model of the Web.

Authoring

The ability to create and update content leads to the collaborative work of many authors. Wiki users may extend, undo, redo and edit each other's work. Comment systems allow readers to contribute their viewpoints.

Tags

Categorization of content by users adding "tags" — short, usually one-word or two-word descriptions — to facilitate searching. For example, a user can tag a metal song as "death metal". Collections of tags created by many users within a single system may be referred to as "folksonomies" (i.e., folk taxonomies).

Extensions

Software that makes the Web an application platform as well as a document server. Examples include Adobe Reader, Adobe Flash, Microsoft Silverlight, ActiveX, Oracle Java, QuickTime, WPS Office and Windows Media.

Signals

The use of syndication technology, such as RSS feeds to notify users of content changes.

While SLATES forms the basic framework of Enterprise 2.0, it does not contradict all of the higher level Web 2.0 design patterns and business models. It includes discussions of self-service IT, the long tail of enterprise IT demand, and many other consequences of the Web 2.0 era in enterprise uses.^[38]

A third important part of Web 2.0 is the social web. The social Web consists of a number of online tools and platforms where people share their perspectives, opinions, thoughts and experiences. Web 2.0 applications tend to interact much more with the end user. As such, the end user is not only a user of the application but also a participant by:

• Podcasting
• Blogging
• Tagging
• Curating with RSS
• Social bookmarking
• Social networking
• Social media
• Wikis
• Web content voting: Review site or Rating site

The popularity of the term Web 2.0, along with the increasing use of blogs, wikis, and social networking technologies, has led many in academia and business to append a flurry of 2.0's to existing concepts and fields of study,^[39] including Library 2.0, Social Work 2.0,^[40] Enterprise 2.0, PR 2.0,^[41] Classroom 2.0,^[42] Publishing 2.0,^[43] Medicine 2.0,^[44] Telco 2.0, Travel 2.0, Government 2.0,^[45] and even Porn 2.0.^[46] Many of these 2.0s refer to Web 2.0 technologies as the source of the new version in their respective disciplines and areas. For example, in the Talis white paper "Library 2.0: The Challenge of Disruptive Innovation", Paul Miller argues

"Blogs, wikis and RSS are often held up as exemplary manifestations of Web 2.0. A reader of a blog or a wiki is provided with tools to add a comment or even, in the case of the wiki, to edit the content. This is what we call the Read/Write web. Talis believes that Library 2.0 means harnessing this type of participation so that libraries can benefit from increasingly rich collaborative cataloging efforts, such as including contributions from partner libraries as well as adding rich enhancements, such as book jackets or movie files, to records from publishers and others."^[47]

Here, Miller links Web 2.0 technologies and the culture of participation that they engender to the field of library science, supporting his claim that there is now a "Library 2.0". Many of the other proponents of new 2.0s mentioned here use similar methods. The meaning of Web 2.0 is role dependent. For example, some use Web 2.0 to establish and maintain relationships through social networks, while some marketing managers might use this promising technology to "end-run traditionally unresponsive I.T. department[s]."^[48]

There is a debate over the use of Web 2.0 technologies in mainstream education. Issues under consideration include the understanding of students' different learning modes; the conflicts between ideas entrenched in informal online communities and educational establishments' views on the production and authentication of 'formal' knowledge; and questions about privacy, plagiarism, shared authorship and the ownership of knowledge and information produced and/or published on line.^[49]

Web 2.0 is used by companies, non-profit organisations and governments for interactive marketing. A growing number of marketers are using Web 2.0 tools to collaborate with consumers on product development, customer service enhancement, product or service improvement and promotion. Companies can use Web 2.0 tools to improve collaboration with both its business partners and consumers. Among other things, company employees have created wikis—Websites that allow users to add, delete, and edit content — to list answers to frequently asked questions about each product, and consumers have added significant contributions.

Another marketing Web 2.0 lure is to make sure consumers can use the online community to network among themselves on topics of their own choosing.^[50] Mainstream media usage of Web 2.0 is increasing. Saturating media hubs—like The New York Times, PC Magazine and Business Week — with links to popular new Web sites and services, is critical to achieving the threshold for mass adoption of those services.^[51] User web content can be used to gauge consumer satisfaction. In a recent article for Bank Technology News, Shane Kite describes how Citigroup's Global Transaction Services unit monitors social media outlets to address customer issues and improve products.^[52]

In tourism industries, social media is an effective channel to attract travellers and promote tourism products and services by engaging with customers. The brand of tourist destinations can be built through marketing campaigns on social media and by engaging with customers. For example, the "Snow at First Sight" campaign launched by the State of Colorado aimed to bring brand awareness to Colorado as a winter destination. The campaign used social media platforms, for example, Facebook and Twitter, to promote this competition, and requested the participants to share experiences, pictures and videos on social media platforms. As a result, Colorado enhanced their image as a winter destination and created a campaign worth about $2.9 million.^{[citation needed]}

The tourism organisation can earn brand royalty from interactive marketing campaigns on social media with engaging passive communication tactics. For example, "Moms" advisors of the Walt Disney World are responsible for offering suggestions and replying to questions about the family trips at Walt Disney World. Due to its characteristic of expertise in Disney, "Moms" was chosen to represent the campaign.^[53] Social networking sites, such as Facebook, can be used as a platform for providing detailed information about the marketing campaign, as well as real-time online communication with customers. Korean Airline Tour created and maintained a relationship with customers by using Facebook for individual communication purposes.^[54]

Travel 2.0 refers a model of Web 2.0 on tourism industries which provides virtual travel communities. The travel 2.0 model allows users to create their own content and exchange their words through globally interactive features on websites.^[55][56] The users also can contribute their experiences, images and suggestions regarding their trips through online travel communities. For example, TripAdvisor is an online travel community which enables user to rate and share autonomously their reviews and feedback on hotels and tourist destinations. Non pre-associate users can interact socially and communicate through discussion forums on TripAdvisor.^[57]

Social media, especially Travel 2.0 websites, plays a crucial role in decision-making behaviors of travelers. The user-generated content on social media tools have a significant impact on travelers choices and organisation preferences. Travel 2.0 sparked radical change in receiving information methods for travelers, from business-to-customer marketing into peer-to-peer reviews. User-generated content became a vital tool for helping a number of travelers manage their international travels, especially for first time visitors.^[58] The travellers tend to trust and rely on peer-to-peer reviews and virtual communications on social media rather than the information provided by travel suppliers.^[57][53]

In addition, an autonomous review feature on social media would help travelers reduce risks and uncertainties before the purchasing stages.^[55][58] Social media is also a channel for customer complaints and negative feedback which can damage images and reputations of organisations and destinations.^[58] For example, a majority of UK travellers read customer reviews before booking hotels, these hotels receiving negative feedback would be refrained by half of customers.^[58]

Therefore, the organisations should develop strategic plans to handle and manage the negative feedback on social media. Although the user-generated content and rating systems on social media are out of a business' controls, the business can monitor those conversations and participate in communities to enhance customer loyalty and maintain customer relationships.^[53]

Web 2.0 could allow for more collaborative education. For example, blogs give students a public space to interact with one another and the content of the class.^[59] Some studies suggest that Web 2.0 can increase the public's understanding of science, which could improve government policy decisions. A 2012 study by researchers at the University of Wisconsin–Madison notes that

"...the internet could be a crucial tool in increasing the general public's level of science literacy. This increase could then lead to better communication between researchers and the public, more substantive discussion, and more informed policy decision."^[60]

Ajax has prompted the development of Web sites that mimic desktop applications, such as word processing, the spreadsheet, and slide-show presentation. WYSIWYG wiki and blogging sites replicate many features of PC authoring applications. Several browser-based services have emerged, including EyeOS^[61] and YouOS.(No longer active.)^[62] Although named operating systems, many of these services are application platforms. They mimic the user experience of desktop operating systems, offering features and applications similar to a PC environment, and are able to run within any modern browser. However, these so-called "operating systems" do not directly control the hardware on the client's computer. Numerous web-based application services appeared during the dot-com bubble of 1997–2001 and then vanished, having failed to gain a critical mass of customers.

Many regard syndication of site content as a Web 2.0 feature. Syndication uses standardized protocols to permit end-users to make use of a site's data in another context (such as another Web site, a browser plugin, or a separate desktop application). Protocols permitting syndication include RSS (really simple syndication, also known as Web syndication), RDF (as in RSS 1.1), and Atom, all of which are XML-based formats. Observers have started to refer to these technologies as Web feeds.

Specialized protocols such as FOAF and XFN (both for social networking) extend the functionality of sites and permit end-users to interact without centralized Web sites.

Web 2.0 often uses machine-based interactions such as REST and SOAP. Servers often expose proprietary Application programming interfaces (APIs), but standard APIs (for example, for posting to a blog or notifying a blog update) have also come into use. Most communications through APIs involve XML or JSON payloads. REST APIs, through their use of self-descriptive messages and hypermedia as the engine of application state, should be self-describing once an entry URI is known. Web Services Description Language (WSDL) is the standard way of publishing a SOAP Application programming interface and there are a range of Web service specifications.

In November 2004, CMP Media applied to the USPTO for a service mark on the use of the term "WEB 2.0" for live events.^[63] On the basis of this application, CMP Media sent a cease-and-desist demand to the Irish non-profit organisation IT@Cork on May 24, 2006,^[64] but retracted it two days later.^[65] The "WEB 2.0" service mark registration passed final PTO Examining Attorney review on May 10, 2006, and was registered on June 27, 2006.^[63] The European Union application (which would confer unambiguous status in Ireland)^[66] was declined on May 23, 2007.

Critics of the term claim that "Web 2.0" does not represent a new version of the World Wide Web at all, but merely continues to use so-called "Web 1.0" technologies and concepts:^[8]

• First, techniques such as Ajax do not replace underlying protocols like HTTP, but add a layer of abstraction on top of them.
• Second, many of the ideas of Web 2.0 were already featured in implementations on networked systems well before the term "Web 2.0" emerged. Amazon.com, for instance, has allowed users to write reviews and consumer guides since its launch in 1995, in a form of self-publishing. Amazon also opened its API to outside developers in 2002.^[67]
  Previous developments also came from research in computer-supported collaborative learning and computer-supported cooperative work (CSCW) and from established products like Lotus Notes and Lotus Domino, all phenomena that preceded Web 2.0. Tim Berners-Lee, who developed the initial technologies of the Web, has been an outspoken critic of the term, while supporting many of the elements associated with it.^[68] In the environment where the Web originated, each workstation had a dedicated IP address and always-on connection to the Internet. Sharing a file or publishing a web page was as simple as moving the file into a shared folder.^[69]
• Perhaps the most common criticism is that the term is unclear or simply a buzzword. For many people who work in software, version numbers like 2.0 and 3.0 are for software versioning or hardware versioning only, and to assign 2.0 arbitrarily to many technologies with a variety of real version numbers has no meaning. The web does not have a version number. For example, in a 2006 interview with IBM developerWorks podcast editor Scott Laningham, Tim Berners-Lee described the term "Web 2.0" as jargon:^[8]

  "Nobody really knows what it means... If Web 2.0 for you is blogs and wikis, then that is people to people. But that was what the Web was supposed to be all along... Web 2.0, for some people, it means moving some of the thinking [to the] client side, so making it more immediate, but the idea of the Web as interaction between people is really what the Web is. That was what it was designed to be... a collaborative space where people can interact."

• Other critics labeled Web 2.0 "a second bubble" (referring to the Dot-com bubble of 1997–2000), suggesting that too many Web 2.0 companies attempt to develop the same product with a lack of business models. For example, The Economist has dubbed the mid- to late-2000s focus on Web companies as "Bubble 2.0".^[70]
• In terms of Web 2.0's social impact, critics such as Andrew Keen argue that Web 2.0 has created a cult of digital narcissism and amateurism, which undermines the notion of expertise by allowing anybody, anywhere to share and place undue value upon their own opinions about any subject and post any kind of content, regardless of their actual talent, knowledge, credentials, biases or possible hidden agendas. Keen's 2007 book, Cult of the Amateur, argues that the core assumption of Web 2.0, that all opinions and user-generated content are equally valuable and relevant, is misguided. Additionally, Sunday Times reviewer John Flintoff has characterized Web 2.0 as "creating an endless digital forest of mediocrity: uninformed political commentary, unseemly home videos, embarrassingly amateurish music, unreadable poems, essays and novels... [and that Wikipedia is full of] mistakes, half-truths and misunderstandings".^[71] In a 1994 Wired interview, Steve Jobs, forecasting the future development of the web for personal publishing, said:

  "The Web is great because that person can't foist anything on you—you have to go get it. They can make themselves available, but if nobody wants to look at their site, that's fine. To be honest, most people who have something to say get published now."^[72]

  Michael Gorman, former president of the American Library Association has been vocal about his opposition to Web 2.0 due to the lack of expertise that it outwardly claims, though he believes that there is hope for the future.:^[73]

  "The task before us is to extend into the digital world the virtues of authenticity, expertise, and scholarly apparatus that have evolved over the 500 years of print, virtues often absent in the manuscript age that preceded print".

• There is also a growing body of critique of Web 2.0 from the perspective of political economy. Since, as Tim O'Reilly and John Batelle put it, Web 2.0 is based on the "customers... building your business for you,"^[25] critics have argued that sites such as Google, Facebook, YouTube, and Twitter are exploiting the "free labor"^[74] of user-created content.^[75] Web 2.0 sites use Terms of Service agreements to claim perpetual licenses to user-generated content, and they use that content to create profiles of users to sell to marketers.^[76] This is part of increased surveillance of user activity happening within Web 2.0 sites.^[77] Jonathan Zittrain of Harvard's Berkman Center for the Internet and Society argues that such data can be used by governments who want to monitor dissident citizens.^[78] The rise of AJAX-driven web sites where much of the content must be rendered on the client has meant that users of older hardware are given worse performance versus a site purely composed of HTML, where the processing takes place on the server.^[79] Accessibility for disabled or impaired users may also suffer in a Web 2.0 site.^[80]
• Others have noted that Web 2.0 technologies are tied to particular political ideologies. "Web 2.0 discourse is a conduit for the materialization of neoliberal ideology."^[81] The technologies of Web 2.0 may also "function as a disciplining technology within the framework of a neoliberal political economy."^[82]
• When looking at Web 2.0 from a cultural convergence view, according to Henry Jenkins,^[83] it can be problematic because the consumers are doing more and more work in order to entertain themselves. For instance, Twitter offers online tools for users to create their own tweet, in a way the users are doing all the work when it comes to producing media content.

Application domains

Wikimedia Commons has media related to Web 2.0.

• Learning materials related to Web 2.0 at Wikiversity

Scholia has a profile for Web 2.0 (Q131164).

• Web 2.0 / Social Media / Social Networks. Charleston, South Carolina, SUA: MultiMedia. 2017. ISBN 978-1-544-63831-7.