Web 2.0 based web application allows users to do more than just retrieve information. Well in Web1.0 user can build on the interactive facilities on the website by considering "Network as platform" that allowing users to run software-applications entirely through a browser. Web 2.0 is the second coming of World Wide Web, and it provide users a way of interacting with each other, and organize and categorize their content more effectively. Web 2.0 sites often feature a rich, user-friendly interface based on Ajax, Flex or similar rich media. The sites may also have social-networking aspects.

Key principles that shape the foundation of Web 2.0

The primary idea Web 2.0 is use the www as a platform where software would function as a service over the web, just same they runs on a desktop computer. Few points of web 2.0:

• Provide the feature to www as a platform
• Information/data as the dynamic force
• Network created by an architecture of participation
• Modernization websites by drawing features from distributed, independent developers/programmers
• Content and service syndication facilitated business models
• Software adoption cycle no longer indispensable
• Software more of a multifaceted device drawing features from a wider source

A Web 2.0 website can be developed using the feature and technologies mentioned below

• AJAX or Flex based rich internet application (RIA) techniques
• Validated XHTML/HTML markup based on CSS (Cascading Style Sheet) to keep content and presentation separate
• Mash-ups of content from multiple sources
• Blog publishing tools
• Meaningful and user-friendly URLs
• Wiki and forum features
• Social networking features
• User-generated content management
• RSS and Atom feed syndication, aggregation and notification