Web 2.0 refers to websites that allow users to interact with each other and change content, in contrast to earlier websites where users could only view information. Examples include social media sites, blogs, and sites that let users share videos or collaborate on wikis. Key characteristics include treating other websites as sources of services to integrate, and prioritizing user-generated content over traditional information.

1. Web 2.0 The term Web 2.0 is commonly associated with web applications that facilitate interactive information sharing, user-centered design, and collaboration on the World Wide Web.

2. Examples of Web 2.0 include web-based communities, hosted services, web applications, social-networking sites, video-sharing sites, wikis, blogs, and mashups.

3. It allows its users to interact with other users or to change website content, in contrast to non-interactive websites where users are limited to viewing of information that is provided to them.