What is Web 2.0?

Marco van Hout of Design and Emotion explains:

"After we have created website experiences that were focused on retrieving information, it is now the experience itself that has the focus in Web 2.0 developments.

"Even though many criticise the terminology of Web 2.0, I believe it is not such a bad thing to find the right name for an existing and developing phenomenon. Web 2.0 is all about experience... the web is not site-centric anymore, but user-centric. Where with Web 1.0, 1.5, etc. it was all about providing people with information and that was it, Web 2.0 refers to all of those sites that provide an experience."

Good examples are Flickr, del.icio.us, and Wikipedia.