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AJAX, or Ajax, is a web development technique used for creating interactive web applications. The intent is to make web pages feel more responsive by exchanging small amounts of data with the server behind the scenes, so that the entire web page does not have to be reloaded each time the user requests a change. This is intended to increase the web page's interactivity, speed, functionality, and usability.

AJAX is asynchronous in that loading does not interfere with normal page loading. JavaScript is the programming language in which AJAX function calls are made. Data retrieved using the technique is commonly formatted using XML, as reflected in the naming of the XMLHttpRequest object from which AJAX is derived.

AJAX is a cross-platform technique usable on many different operating systems, computer architectures, and Web browsers as it is based on open standards such as JavaScript and XML, together with open source implementations of other required technologies.

Developer note

POSTing large quantities of data (e.g., 2,200 characters in length) to a script running on an HTTPS server, with Extra Security enabled, may result in an HTTP 503 error ("Service Temporarily Unavailable"). This error is generated by mod_security - see that article for instructions on disabling it for specific scripts.

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