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AJAX, short for Asynchronous JavaScript and XML, isn't a technology but rather a grouping of technologies. AJAX uses a communication technology (typically SOAP and XML) to send and receive an asynchronous request/response to the server, and then leverages presentation technologies (JavaScript, DOM, HTML, and CSS) to process the response. Applications using AJAX are legitimate today, because most browsers support the necessary technology.

AJAX can serve as an XML data transport layer or returning pre-formed HTML then injected into the browser DOM. Considered by many to be a mesh of DHTML and XMLHttpRequest this technology allows AJAX developers to provide rich content experiences without constant page reloads.