AJAX(asynchronous javascript and
xml) :
1. Ajax is a set of client side
technologies that provides asynchronous
communication between user interface and
web server.
2. So the advantages of using ajax are
asynchronous communication,minimal data transfer and server is not overloaded
with unnecessary load.
3. xmlHttpRequest object allows the
browser to communicate to a back end server asynchronously
4. xmlHttpRequest object allows the
browser to communicate with server with out posting the whole page and only
sending the necessary data asynchronously
