WHAT IS WEB 2.0 ???

Web 2.0, through its numerous definitions, encapsulates the idea of the proliferation of interconnectivity and interactivity of web-delivered content.

Tim O'Reilly regards Web 2.0 as business embracing the web as a platform and using its strengths, for example global audiences.

O'Reilly considers that Eric Schmidt's abridged slogan, don't fight the Internet, encompasses the essence of Web 2.0 — building applications and services around the unique features of the Internet, as opposed to expecting the Internet to suit as a platform (effectively "fighting the Internet").

According to O'Reilly and Battelle, an architecture of participation where users can contribute website content creates network effects. Web 2.0 technologies tend to foster innovation in the assembly of systems and sites composed by pulling together features from distributed, independent developers. (This could be seen as a kind of "open source" an end to the traditional software adoption cycle, typified by the so-called "perpetual beta".)

Web 2.0 technology encourages lightweight business models enabled by syndication of content and of service and by ease of picking-up by early adopters

In alluding to the version-numbers that commonly designate software upgrades, the phrase "Web 2.0" hints at an improved form of the World Wide Web. Technologies such as weblogs (blogs), wikis, podcasts, RSS feeds (and other forms of many-to-many publishing), social software, and web application programming interfaces (APIs) provide enhancements over read-only websites.

Stephen Fry, who writes a column about technology in the British Guardian newspaper, describes Web 2.0 as:
“…an idea in people's heads rather than a reality. It’s actually an idea that the reciprocity between the user and the provider is what's emphasized. In other words, genuine interactivity, if you like, simply because people can upload as well as download”

The idea of "Web 2.0" can also relate to a transition of some websites from isolated information silos to interlinked computing platforms that function like locally-available software in the perception of the user.

Web 2.0 also includes a social element where users generate and distribute content, often with freedom to share and re-use. This can result in a rise in the economic value of the web to businesses, as users can perform more activities online.