Ajax (also AJAX /ˈeɪdʒæks/; short for “Asynchronous JavaScript And XML”) is a set of Web development techniques using many web technologies on the client side to create asynchronous Web applications. With Ajax, web applications can send and retrieve data from a server asynchronously (in the background) without interfering with the display and behavior of the existing page.

Ajax is not a single technology, but rather a group of technologies. HTML and CSS can be used in combination to mark up and style information.

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