Web2.0, the second phase in the web’s evolution, is attracting the Attention of IT professionals, businesses, and web users.Web2.0 harnesses the web in a more interactive and collaborative manner, emphasizing peers social interaction and collective intelligence and presents new opportunities for leveraging the web and engaging its users more effectively. This paper will help to understand web2.0 and its potential so that we can harness it capabilities effectively. Web2.0 is a collection of technologies, business strategies and social trends, which are explained in this paper. Web2.0 is more dynamic and interactive than its predecessor Web1.0. Various opportunities and threats are faced by web2.0. Testing in Web2.0 is an area of Concern now a days. Testing in web2.0 is very different from testing in web1.0, which we overview in the paper. Thus we conclude with that web2.0 is an important phenomenon that should not be ignored
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