What do you mean by Web 2.0?

Web 2.0 was referred to as this idea of the so-called Web as a platform. The concept was such that instead of thinking of the Web as a place where browsers viewed data through small windows on the readers' screens, the Web was actually the platform that allowed people to get things done. But this really didn't catch on. In fact, it's fairly hard to grasp what that really means.Later people started thinking of Web 2.0 as the programming tools used to create the Web pages that were considered cutting edge Web 2.0. This included AJAX and SOAP and other XML and JavaScript applications that allowed the readers to actually interact with the Web pages more like you would with an application on your desktop.