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Web 2.0 is a term which suggests a new version of the World Wide Web. Web 2.0 is known to be the 2nd generation of Internet. It is believed to be a platform over the Internet which allows everyone amongst us to use the digital media to convey ourselves and recognize our potential.

Web 2.0 applications are those that make the most of the built-in advantages of the platform: distributing regularly updated service that gets superior the more people make use of it, using and blending data from numerous sources, including individual users, building set of connections through an "architecture of participation," and conveying rich user experiences.

It respects the innovative amateur: the self-trained filmmaker, the dorm-room musician, the writer looking for a break to publish their writings. Web 2.0 "empowers" the creativity of an individual, it "democratizes" media, it provides a common platform for the experts and amateurs.

Web 2.0 refers to two major standard shifts; one most advertised being the "user-generated content," which narrates more to individuals. The second, and equally important, but more associated to business, is "thin client computing."

User-generated content, comprising of blogs, Wikis and social networking sites, such as Digg, MySpace and Friendster, allow users to speak on anything and publish it on the web to get global crowd. With the current development in technology the users can effortlessly build up personal Web pages, create a blog, and publish their views, images, audio and video.

In thin client computing, data and applications are stored on Web servers, and a user has access from any computer via a Web browser. Thin clients are not new but are largely rejuvenated by the Internet. Many believe that thin client computing will eventually supplant locally installed office and other applications and that turning the Web into a gigantic application server is the ultimate manifestation of Web 2.0 and even "client/server" computing.

Lists of few essential ingredients of the Web 2.0 are mentioned below:

• 1. Ajax - One of the significant ingredients is undoubtedly “Ajax” meaning "Javascript now works", which redefines the web-experience and has made web-based applications to work much more like desktop ones.
• 2. Democracy - The second most important ingredient is Democracy, which will allow every individual to show their expertise. We have numerous examples which provide evidence that amateurs can outshine professionals. We have been regularly coming across good piece of work in some private blogs which are much better than the editor-damped writings.
• 3. Don't Maltreat Users - A third ingredient is being user-friendly and offers something free to the users for which they are usually charged in other competitor sites. Some of the sites which have got much hype had been successfully catering to the users need and offers the users a lot of free software, articles and other resources.
  
  The complex and developing technology infrastructure of the Web 2.0 includes server-software, content-syndication, messaging protocols, standards browsers with many helpful plugins and extensions, and various client-applications. Although these complementary approaches are different but provide Web 2.0 with lots of functionality like information-storage, creation, and broadcasting capabilities that go beyond what the public formerly expected from websites.