Web 2.0 is a use of World Wide Web technology that aims to enhance creativity, information sharing, and, collaboration among users. This have led to the development of web-based communities such as social-networking sites (myspace.com, facebook.com, friendster.com, wikis, and blogs. The key is interaction between people and website.
The term became notable after the first O’Reilly Media Web 2.0 conference in 2004.
You can check a lot of Web 2.0 at http://www.go2web20.net
