What is AJAX?
The XMLHttpRequest object is part of a technology called AJAX.
AJAX is very faster and easy, we can implement AJAX in a meaningful manner.
It is a group of related technologies looks like,
a) HTML/XHTML and CSS
c) XML or JSON
The AJAX was popular in 2005 by Google, with Google Suggest.
Where it is used?
The AJAX technology used by
c) Twitter etc.