AJAX is a set of techniques that run on the client browser to create interactive websites. It allows updates to the current page to be made in more or less real-time without having to reload the page from the server. AJAX has been a substantial technological advancement driving the development of so-called "Web 2.0" applications or RIA (Rich Internet Applications) by facilitating a more seamless refresh and partial refresh of internet application interfaces.

AJAX on Wikipedia

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