Ajax means asynchronous JavaScript and XML.it is used to partially update the content of web pages excluding complete page.Web form submit complete form content under server but ajax can post data without using web form.It is used to improve performance of a web application.
javascript is used to handle event and xml is used to transfer data from client machine to server machine and server machine to client machine. It use xmlhttprequest and xmlhttpresponse to send and receive data.
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