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 viewing other websites as sources of services to integrate, and prioritizing user-generated over traditional content.

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

4. Web 2.0 does not suggest any update to technical specification of how to develop a web application.

5. It provides the information of wed development styles, method of interaction, and sources of content.

7. Information : user generated content is the most impotant information in web 2.0.