Web 2.0 technologies such as blogs, social bookmarking, wikis, podcasts, RSS feeds, and social software have led to a more dynamic, real-time, and user-contributed experience over the internet, implying significant changes in how people use and interact with the web. However, these new technologies also present evolving security threats that must be addressed through improved defenses. The document discusses the definition and characteristics of Web 2.0 technologies and their impact on web usage.