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A tag cloud (a typical Web 2.0 phenomenon in itself) presenting Web 2.0 themes

Web 2.0 (also known as Participative (or Participatory)[1] and Social Web[2]) refers to websites that emphasizes user-generated content, ease of use, participatory culture and interoperability (i.e., compatible with other products, systems, and devices) for end users.

The term was invented by Darcy DiNucci in 1999 and later popularized by Tim O'Reilly and Dale Dougherty at the O'Reilly Media Web 2.0 Conference in late 2004.[3][4][5][6] The Web 2.0 framework only specifies the design and use of websites and does not place any technical demands or specifications on designers. The transition was gradual and, therefore, no precise date for when this change happened has been given.[which?][2]

A Web 2.0 website allows users to interact and collaborate with each other 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 viewing content in a passive manner. 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), 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.[7] His original vision of the Web was "a collaborative medium, a place where we [could] all meet and read and write."[8][9] On the other hand, the term Semantic Web (sometimes referred to as Web 3.0)[10] was coined by Berners-Lee to refer to a web of content where the meaning can be processed by machines.[11]