The term web2.0 was originally presented by O’Reilly Media.
“Web 2.0 is a combination of principles and practices tied together to develop a new trend in World Wide Web and web applications to encourage interactivity among users.”
Web 2.0 concepts have led to the development and evolution of web culture communities and hosted services, such as social-networking sites, video sharing sites, wikis, blogs, and folksonomies.
Characteristics of Web2.0
Web 2.0 websites allow users to do more than just retrieve information by allowing them to run software-applications entirely through a browser. Users can own the data on a Web 2.0 site and exercise control over that data.
A web2.0 website is completely interactive and dynamic with a user-friendly interface based on the latest web2.0 technologies like AJAX.
A web2.0 website implements social networking capabilities allowing users to interact with each other and create friend lists.
Web2.0 websites are democratic websites where users are able to add value by interacting with the web based application.
Such websites allow it’s users to exercise various controls over the website data and content (adding/deleting/editing content).
Examples of successful web2.0 websites
YouTube.com, Social Bookmarking site like Digg.com, MySpace.com etc.