Google, blogs, wikis, social networking sites, and Twitter are just a few of the services that encompass the concept of Web 2.0, which has transformed the ways we interact and do business. This book provides a complete introduction to the services and technologies associated with Web 2.0. It outlines a model for understanding Web 2.0 through three conceptual areas: the big ideas and business/social implications, underlying technologies, and main applications and services. The text covers key concepts, such as the Web’s architecture, foundational technologies and standards, the changing nature of software engineering, and the future of the Web, including the emergence of Web 3.0.