The document discusses the definition and principles of Web 2.0, which refers to a second generation of web development and design that facilitates communication, secure information sharing, interoperability, and collaboration on the World Wide Web. Some typical activities of Web 2.0 include blogs, wikis, social networking, mashups, and podcasting. Key principles include architecture of participation, treating the web as a platform, being data-centric, and using lightweight programming models.

2. What Is Web 2.0? “ Web 2.0 is the business revolution in the computer industry caused by the move to the Internet as platform, and an attempt to understand the rules for success on that new platform.” Tim O’Reilly

3. What Is Web 2.0? (continued) It has also become a convenient marketing term for people who don’t really understand what Web 2.0 means but who want to sound like they do.

10. Blogging

12. Data-centricity

13. Allow other developers to build on it

15. Lightweight Programming Models

17. Mash-ups

18. iPod and iTunes

20. Tagging