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Why do we use the XMLHttpRequest object in AJAX?

  •  Javascript uses the XMLHttpRequest object to manipulate XML and other text data between client and server. 
  •  AJAX applications use the XMLHttpRequest object to avoid the postback of entire page when the browser is communicating with server. 
  •  The XMLHttpRequest object enables a client-side script to execute an HTTP request. 
  •  For this functionality MSXML ActiveX component is used in earlier version of Internet Explorer. While, XMLHttpRequest is used in Internet Explorer 7 and other browsers, such as Mozilla, Firefox.