An Introduction to AJAX

AJAX (Asynchronous JavaScript and XML) is the latest boom in the Web development world. AJAX helps developers narrow the gap between desktop and web applications — Google Earth, Flicker and MS Outlook Express Web Version are some of the applications powered by AJAX.

Asynchronous means that you can make a request to a server and perform other actions while the server is processing your request -- and on the arrival of the response required actions can be performed -- as opposed to conventional web applications, in which the user has to sit back and stare at the blank screen while the server is processing the request.

AJAX Architecture :


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Source : Topcoder