Ans: AJAX means Asynchronous JavaScript And XML. AJAX use for Read data from a web server - after the page has loaded. Update a web page without reloading the page. Send data to a web server - in the background.
AJAX just uses a combination of, A browser built-in XMLHttpRequest object (to request data from a web server). JavaScript and HTML DOM (to display or use the data). AJAX is not a programming language.
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AJAX Introduction
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AJAX XMLHttpRequest
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AJAX Request
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AJAX Response
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AJAX Example