A Glimpse of WEB 2.0 & WEB 3.0

Web 2.0 refers to a perceived second generation of web-based communities and hosted services — such as social-networking sites, wikis and folksonomies — which aim to facilitate collaboration and sharing between users. Although the term suggests a new version of the World Wide Web, it does not refer to an update to any technical specifications. According to Tim O'Reilly, "Web 2.0 is the business revolution in the computer industry caused by the move to the internet as platform, and an attempt to understand the rules for success on that new platform. The phrase "Web 2.0" hints at an improved form of the World Wide Web.
The phrase "Web 2.0" can also refer to the transition of websites from isolated information silos to interlinked computing platforms that act like software to the user. Web 2.0 also includes a social element where users generate and distribute content, often with freedom to share and re-use. The result is a rise in the economic value of the Web as users can do more online.

Earlier users of the phrase "Web 2.0" employed it as a synonym for "Semantic Web".
web 3.0 is a term that has use to describe describe various evolution of Web usage and interaction along several separate paths. These include transforming the Web into a database, a move towards making content accessible by multiple non-browser applications, the leveraging of artificial intelligence technologies, the Semantic web, the Geospatial Web, or the 3D web. More often it is used as a marketing ploy to hype incremental improvements of Web 2.0.
The term Web 3.0 first appeared prominently in early 2006 in a blog article by Jeffrey Zeldman critical of Web 2.0 and associated technologies such as Ajax.
Web 3.0 technologies, such as intelligent software that utilize semantic data, have been implemented and used on a small scale by multiple companies for the purpose of more efficient data manipulation. In recent years, however, there has been an increasing focus on bringing semantic web technologies to the general public.
The first step towards a "Web 3.0" is the emergence of "The Data Web" as structured data records are published to the Web in reusable and remotely queryable formats, such as XML, RDF and microformats. The Data Web enables a new level of data integration and application interoperability, making data as openly accessible and linkable as Web pages. The Data Web is the first step on the path towards the full Semantic Web. In the Data Web phase, the focus is principally on making structured data available using RDF. The full Semantic Web stage will widen the scope such that both structured data and even what is traditionally thought of as unstructured or semi-structured content (such as Web
pages, documents, etc.) will be widely available in RDF and OWL semantic formats.

Web 3.0 has also been used to describe an evolutionary path for the Web that leads to artificial intelligence that can reason about the Web in a quasi-human fashion.
There is also debate over whether the driving force behind Web 3.0 will be intelligent systems, or whether intelligence will emerge in a more organic fashion.
Where Web 1.0 was a "read-only" web, with content being produced by in large by the organizations backing any given site, and Web 2.0 was an extension into the "read-write" web that engaged users in an active role, Web 3.0 could extend this one step further by allowing people to modify the site itself.