This document provides an overview of Web 2.0, including its key characteristics and technologies. It discusses how Web 2.0 enables participation, personalization, and democratization through features like rich user interfaces, dynamic content, metadata, and social media. Popular examples of Web 2.0 sites that empower users to interact and create content are mentioned. The document also notes some criticisms of Web 2.0 and implications for marketers in how it blurs lines between consumers and producers.