AJAX

AJAX stands for Asynchronous JavaScript and XML. AJAX makes browser looks like a desktop application, by allowing you to download the data from server behind the scenes. By using AJAX, you no need to refresh entire web page; you can get the data by an AJAX call, and update specific portion of the web page.

Very good example for this is Google search. When you are typing in Google search box, behind scenes, browser checks with Google server, and send you the suggestions (Full page is not refreshed here).

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