Web 2.0 
The concept of "Web 2.0" began with a conference brainstorming session between O'Reilly and MediaLive International. "Web 2.0" refers to a second generation of web development and design, that facilitates communication, secures information sharing, collaboration on the WWW (World Wide Web).
Web 2.0 mostly use in following applications such as
1) social-networking sites
2) video-sharing sites
3) Wikis
4) blogs.
Web 2.0 mostly use in following purpose.
• Simplifies distribution
• Easy way of maintaining code
• Faster speed to market
• Share data across devices
• Subscription model vs. one off purchase
• Faster time to market
• Reduced risk
• Closer relationship with customers
• Real-time data to make quantifiable decisions
• Increased responsiveness
Web 2.0 websites typically include some of the following features/techniques. Andrew McAfee used the acronym SLATES to refer to them
Search
The ease of finding information through keyword search.
Links
Ad-hoc guides to other relevant information.
Authoring
The ability to create constantly updating content over a platform that is shifted from being the creation of a few to being constantly updated, interlinked work. In wikis, the content is iterative in the sense that users undo and redo each other's work. In blogs, content is cumulative in that posts and comments of individuals are accumulated over time.
Tags
Categorization of content by creating tags: simple, one-word user-determined descriptions to facilitate searching and avoid rigid, pre-made categories.
Extensions
Powerful algorithms that leverage the Web as an application platform as well as a document server.
Signals
The use of RSS technology to rapidly notify users of content changes.
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