"This e-book-based on Chapter 3 of Internet & World Wide Web How to Program, 4/e-introduces the principles, applications, technologies, companies, business models and monetization strategies of Web 2.0. We'll be updating this e-book frequently. For the latest HTML version, visit http://www.deitel.com/freeWeb20ebook/. It is also available as a downloadable, fully-formatted PDF for a small fee."