History Of Ajax

Basically AJAX is Based on Web Standards .It is  based on JavaScript, XML, HTML and CSS web standards. This is a library which is combination of these all standards.

AJAX was first  made popular in 2005 by Google. When Google has used  Ajax in  Google Suggest. Google suggest communicate with server without refreshing the page .In Google suggest when we enter any character then on release the key the request post to server and sever immediately response according that character .

e.g. When we enter "a" then Google suggest display all matches with a then and when we enter "ab" then all results with start "ab" will response by server.
 

You can refer following URL for more: This is link of Google suggest

http://www.google.com/webhp?complete=1&hl=en

So we can say Google is mother of Ajax.

AJAX is based on existing standards .Google combines these standards and make a library that  is call Ajax.  These standards have been used by most developers.