Web 2.0 was coined in 1999 to describe web sites that use technology beyond the static pages of earlier web sites. A Web 2.0 site may allow users to interact and collaborate with each other in a social media dialogue as creators of user-generated content in a virtual community, in contrast to websites where people are limited to the passive viewing of content. Examples of Web 2.0 include social networking sites( Facebook, Twitter,etc.), blogs, wikis, video sharing sites, hosted services, web applications, etc.

Web 3.0 can be defined as the first-generation Metaverse (convergence of the virtual and physical world), a web development layer that includes TV-quality open video, 3D simulations, augmented reality, human-constructed semantic standards, and pervasive broadband, wireless, and sensors. Web 3.0's early geosocial (Foursquare, etc.) and augmented reality (Layar, etc.) webs are an extension of Web 2.0's participatory technologies and social networks (Facebook, etc.) into 3D space.

A webcast is a media presentation distributed over the Internet using streaming media technology to distribute a single content source to many simultaneous listeners/viewers. A webcast may either be distributed live or on demand. Essentially, webcasting is “broadcasting” over the Internet.

Blogs and wikis make it easy for anyone to publish thoughts or comments on any topic.

Blog is short for ‘web log.’ Blogs are similar to a diary, written online; however, they are available to the public. Users can share their opinions and even comment on what others have to say. You can also post and share documents.

Wikis are websites which allow where users to contribute and/or edit content. Enterprises are adopting the use of wikis to allow team-based content development and maintain documents written by multiple authors. The best known use of wiki technology is Wikipedia, where the entire encyclopedia content has been created through online collaboration.