Web 2.0 refers to next generation web technologies and applications that emphasize user participation, interaction, and collaboration through social media, user-generated content, and web-based communities. Key aspects of Web 2.0 include blogs, wikis, social bookmarking, podcasts, RSS feeds, and APIs that allow users to interact and share information online in new ways beyond traditional websites. Examples of Web 2.0 technologies and applications include Google, BitTorrent, blogging platforms like Blogger, and user-generated encyclopedia Wikipedia.