Web 2.0 is a broad term used to describe the second generation of the World Wide Web. This second generation is defined by being one that focuses on people having the ability to collaborate and share information online. This is compared to orginal World Wide Web technlogy which used mainly static HTML pages, with little to no dynamic content. Instead of such static content, we now have more dynamic content, for users to be able to interact with.
Another aspect of Web 2.0 involve creating applications or web sites where users can form communities, as well as to faciliatate, and open discussions for users. Finally Web 2.0 is often used in reference to sharing information openly.
