AJAX stands for Asynchronous JavaScript And XML.At the core of all this is XMLHttpRequest. Data, content, and design are merged together into a seamless whole. When a user clicks on something on an Ajax driven application, there is very little lag time. It allows a call to be made to the server and data to be returned, all through JavaScript. A user can click on a button and instead of refreshing the whole page, you just update the parts of the page that have changed.
Ajax is a way of developing Web applications that combines:
XHTML and CSS standards based presentation
Interaction with the page through the DOM
Data interchange with XML and XSLT
Asynchronous data retrieval with XMLHttpRequest
JavaScript to tie it all together
Once only available in Internet Explorer, it has made its way into other browsers like Firefox, Safari and Opera. And with the increased support has come the flood of new implementations.
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