What is AJAX?
AJAX started out as an acronym invented a couple of years ago. Microsoft invented something called XML HTTP request. It was a little hard to describe and explain to people so AJAX was coined as Asynchronous JavaScript and XML.
This means is that JavaScript communicates with the server and gets the information it needs and the server replies , gives response in the form of XML.
Traditionally, when users/clients request web pages, the server sends all the HTML and CSS code at once. If the user enters information into this page and requests more servers, the entire page must be loaded again.
When using Ajax, the page is only loaded once. Any processing or modification caused by additional user input occurs in real time.AJAX therefore simply means the page is being updated without appearing to go back to the server and without the web page address being changed.
So, some sites where you can see it in action are Gmail and Google Maps. This makes web pages and web applications much more responsive since only the necessary information is communicated between clients and servers instead of the entire page.
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