Web 2.0 refers to web applications that enable sharing and collaboration through technologies like social media sites, wikis, blogs and folksonomies. It allows users to upload and share content, access information through browsers, and own their own data. Key characteristics include openness, freedom for users to contribute, and collective intelligence through participation. Web 2.0 uses technologies like Ajax and JavaScript to make pages function more like desktop applications and update dynamically based on new fetched data. It has applications in various sectors like academia, business, medicine and government.

1. WEB 2.0

2. INTRODUCTION Web 2.0 " is commonly associated with web applications that facilitate interactive information sharing , interoperability , user-centered design , [1] and collaboration on the World Wide Web . . Examples of Web 2.0 include web-based communities, hosted services , web applications , social-networking sites , video-sharing sites , wikis , blogs , mashups , and folksonomies .

3. Characteristics to upload and share photos to retrieve information to run software-applications entirely through a browser can own the data and exercise control over that data openness, freedom and collective intelligence by way of user participation, can also be viewed as essential attributes of Web 2.0.

4. Technology Web 2.0 draws the capabilities of client-Server-side software, content syndication and the use of network protocols. Its sites provides information storage, creation, and dissemination capabilities. Includes the following features andtechniques of Andrew McAfee used the acronym SLATES

5. SLATES Search Finding information through keyword search. Links Connects information together using the model of the Web Authoring The ability to create and update content,users may extend, undo and redo each other's work. In blogs, posts and the comments.

6. Tags "tags" - short, usually one-word descriptions - to facilitate searching, without dependence on pre-made categories. Collections of tags created by many users within a single system may be referred to as "folksonomies" Extensions Software that makes the Web an application platform as well as a document server. Signals The use of syndication technology to notify users of content changes.

7. works The client-side/web browser technologies typically used in Web 2.0 development are Ajax, Adobe Flash and JavaScript/Ajax frameworks such as Yahoo! UI Library, Dojo Toolkit, MooTools, and jQuery. Overall performance of the site can be increased, as the sending of requests can complete quicker independent of blocking and queueing required to send data back to the client.

8. The data fetched by an Ajax request is typically formatted in XML or JSON format. Use them to transmit structured data in their web application. When this data is received via Ajax, the JavaScript program then uses the Document Object Model (DOM) to dynamically update the web page based on the new data. Web designers can make their pages function like desktop applications. For example, Google Docs uses this technique to create a Web-based word processor.

9. Usage ACADEMIC use of blogs, wikis, and social networking technologies BUSSINESS Library 2.0, Social Work 2.0, Enterprise 2.0, PR 2.0,Classroom 2.0, Publishing 2.0, Medicine 2.0, Telco 2.0, Travel 2.0, Government 2.0, and even Porn 2.0.

10. Advantages of Web 2.0 It is a free tool for traffic generation It allows others to do some of your work for you.In short--it’s viral. It’s convenient. Disadvantages of Web 2.0 It is time consuming

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