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Introduction To AJAX

-Ajax stands for Asynchronous Javascript And XML.
-By working as an extra layer between the user's browser and the web server, Ajax handles server communications in the background, submitting server requests and processing the returned data. The results may then be integrated seamlessly into the page being viewed, without that page needing to be refreshed or a new one loaded.
-In Ajax applications, such server requests are not necessarily synchronized with user actions such as clicking on buttons or links. A well-written Ajax application may already have asked of the server, and received, the data required by the user perhaps before the user even knew she wanted it. This is the meaning of the asynchronous part of the Ajax acronym.