Web 2.0 first emerged in 2003 and refers to new generations of web technologies that enable greater user participation, interaction and data sharing over the internet. It utilizes technologies like AJAX, CSS and web services to create rich interactive experiences and social features. Key aspects include users generating and manipulating content, participatory and social aspects, as well as enhanced interfaces.

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3. For some Web2.0 symbolize the start of a new era of the Web, for others it is merely a marketing buzzword designed to hook unaware venture capitalists on the Web2.0 hype. The term Web2.0 has appeared for the first time in 2003 on a conference organized by O’Reilly media. The event, simply titled “Web 2.0″, attempted to reference the second generation of web technologies such as social communities, server oriented architectures, wikis, blogs, collaborative environments, AJAX, etc. Since then the term has become widely adopted across the entire Web industry and it has ever since being used to describe innovation.

4. DEFINITION OF WEB 2.0

5. A second phase in the development of the world wide web. From a collection of websites to a complete platform of interactive web applications for end users of the web. It is a social software which enables online interaction,facilitates virtual and creates virtual environments where people can collaborate or create virtual communities.

6. Though there is a controversy still going on over the definition of Web 2.0, yet it has some basic common characteristics. These include: --- Web 2.0 use network as a platform as it deliver or receive applications thoroughly via a browser. Users gets, manipulates and controlled the data on the site. Participatory architecture in which user can add or edit value to the application according to their requirement. A rich, interactive, user-friendly interface based on Ajax or similar frameworks. Some social-networking aspects. Enhanced graphical interfaces such as gradients and rounded corners (absent in the so-called Web 1.0 era).

7. A web 2.0 website may usually feature a number of following techniques: Rich Internet application techniques, optionally Ajaxbased. Cascading Style Sheet, CSS . Semantically valid XHTML markup and the use of Microformats. Organization and collection of data in RSS/Atom. Clean and meaningful URLs. Excessive use of folksonomies (in the form of tags or tagclouds). Use of wiki software either completely or partially (where partial use may grow to become the complete platform for the site) partially, e.g. the LAMP solution stack. XACML over SOAP for access control between organizations and domains . Blog publishing. Mashups (A mix up of content and Audio usually from different musical style). REST or XML Webservice APIs.

8. WEB 1.0 WEB 2.0 Double click Ofoto Akamai Mp3.com Britannica Online Personal Websites Evite Domain Name Registration Page Views Screen Scrapping Publishing Content Management System Directories(Taxonomy) Stickiness Google AdSense Flickr Bit Torrent Napster(Limewire) Wikipedia Weblogs Upcoming.org & EVDB Search Engine Speculation Cost Per Click Web Services Participation Wikis Tagging(Folksonomy) Syndication

9. Thats web 2.0. There are a lot of things that get lumped into web 2.0, but thats it in a nutshell. Everything else that gets pulled in, AJAX, rounded corners, community, is just window dressing. Web 2.0 isnt a technology, its a change in how the technology is used.

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