I've recently read the article "What IS Web 2.0: Design Patterns and Business Models for the Next Generation of Software by Tim O'Reilly. I found the article by googling "web 2.0" .

The article compares and contrasts web 1.0 with the web 2.0 by explaining the newer version using terms such as participation, cooperation, transparency and collective intelligence.

So much of the technical jargon was new to me, that I spent a lot of time reading definitions for clarification.