The document discusses the evolution of the web from Web 1.0 to Web 2.0. It defines Web 2.0 as being more interactive, collaborative, social, and open compared to Web 1.0. It provides examples of popular Web 2.0 sites like Google Maps, Flickr, Orkut, and YouTube. It also discusses technologies like AJAX that power dynamic and interactive elements of many Web 2.0 sites.