AJAX, or Asynchronous Javascript And XML, is a client side technique for communication with a web server, Instead of making a Browser level URL request .
AJAX is JavaScript Framework, AJAX calls help to send the HttpRequest from client side (HTML, JSP, PHP ) to server. Using Ajax Calls, multiple request can be made either synchronously or asynchronously.
Advantage of Ajax :
1. Improves page loading performance, process Html elements asynchronously.
2. Multiple HttpRequest can be made from client side.
3. HTML Elements (HTML, php, JSP ) can be read as a response.
4. Ajax Supports GET & POST in all the browsers, other HttpMethods: PUT, DELETE, HEAD etc are supported in all modern browsers.

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