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History of AJAX
Although we are just beginning to realize its full potential, the proven success of famous AJAX-based projects like Google Maps signifies that this is not just another media hype, but rather a promising technology that may change web-applications as we know them.
How does AJAX work
New generation of web-applications
The core idea behind AJAX is to make the communication with the server asynchronous, so that data is transferred and processed in the background. As a result the user can continue working on the other parts of the page without interruption. In an AJAX-enabled application only the relevant page elements are updated, only when this is necessary.
In contrast, the traditional synchronous (postback-based) communication would require a full page reload every time data has to be transferred to/from the server.