Web 2.0 is a second generation of web based service that allows collaboration or sharing between different users to occur.

We classified web 2.0 into various categories, such as blogs and podcasts. All such applications uses web 2.0.

From such applications, we explained them and how web 2.0 has affected them and since these are some of the main aspects of the web, it also affects the internet and the online society.

Web 2.0 can be regarded as a semantic web and therefore will soon evolve into a much better extension of the world wide web.