"AJAX is an acronym for Asynchronous JavaScript and XML. If you think it doesn't say much, we agree. Simply put, AJAX can be read "empowered JavaScript", because it essentially offers a technique for client-side JavaScript to make background server calls(such as from PHP,ASP.NET,JSP,RUby etc) and retrieve additional data as needed, updating certain portions of the page without causing full page reloads".
The XMLHttpRequest object enables JavaScript to access the server asynchronously, so that the user can continue working, while functionality is performed in the background.
The name AJAX was born in 2005, in Jesse James Garret's article at http://www.adaptivepath.com/publications/essays/archives/ 000385.php,
and gained much popularity when used by Google in many of its applications.
Php ajax Faq
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