is a nickname for social media tools which allows users to contribute content easily and to easily connect to each other.

Web 2.0

Explanation:

Web 2.0. means such internet applications which allow sharing and collaboration opportunities to people and help them to express themselves online.  It’s a simply improved version of the first worldwide web, characterised specifically by the change from static to dynamic or user-generated content and also the growth of social media.  

The concept behind Web 2.0 refers to rich web applications, web-oriented architecture, and social web. It refer to changes in the ways web pages are designed and used by the users, without any change in any technical specifications.