AJAX is a combination of technologies (Javascript/XML/HTML) that work together to make Websites that update without refreshing the entire page. With AJAX you can update portions of a web page at a time.
Probably the most critical component of AJAX is the "XMLHttpRequest object". It allows the dynamic transfer of information with the need for a full page refresh. Sites like Google Mail (Gmail.com) and Google Maps (google.com/maps) have really made AJAX popular.
SOURCE : www.referjava.com
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