The term Web 2.0 is commonly associated with web applications that facilitate interactive information sharing, interoperability, user-centered design, and collaboration on the World Wide Web.
A Web 2.0 site gives its users the free choice to interact or collaborate with each other in a social media dialogue as creators of user-generated content in a virtual community, in contrast to websites where users are limited to the passive viewing of content that was created for them.
Web 1.0 vs. Web 2.0
The term "Web 2.0" was coined in 1999 by Darcy DiNucci, a consultant on electronic information design.
In 2004, the term began its rise in popularity, and was define as “Web as Platform”, where software applications are built upon the Web as opposed to upon the desktop.
Web 2.0 websites provide the user with more user-interface, software and storage facilities, all through their browser
“ It's a participatory Web"
Rich user experience, user participation, dynamic content, web standards...