AJAX is Asynchronous JavaScript and XML
AJAX is not a new programming language, but a new way to use existing standards.
The main part is XMLHttpRequest, a server-side object usable in JavaScript, that was implemented into Internet Explorer since the 4.0 version.

AJAX is the art of exchanging data with a server, and update parts of a web page - without reloading the whole page.
It saves resources.
For improving sharing of resources, it is better to use the power of all the client computers rather than just a unique server and network. Ajax allows to perform processing on client computer (in JavaScript) with data taken from the server.
The processing of web page formerly was only server-side, using web services or PHP scripts, before the whole page was sent within the network.
But Ajax can selectively modify a part of a page displayed by the browser, and update it without the need to reload the whole document with all images, menus, etc...
For example, fields of forms, choices of user, may be processed and the result displayed immediately into the same page.

You can use ajax libraries like ajaxtoolkit (for .net).
You can look for more libraries at http://www.c-point.com/javascript_and_ajax_libraries.php

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