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AJAX , is a web development technique used for creating interactive web applications .
The intent is to make web pages feel more responsive by exchanging small amounts of data with the server behind the scenes, so that the entire web page does not have to be reloaded each time the user requests a change.
This is intended to increase the web page's interactivity, speed, functionality, and usability
and Amazon’s A9.com have really made AJAX popular.
These projects demonstrate that Ajax is not another technology that only works in a laboratory, but also practical for real-world applications And also Ajax applications can be any size, from the very simple, single-function Google Suggest to the very complex and sophisticated Google Maps.
How Ajax is Different from normal Applications
Most user actions in the interface trigger an HTTP request back to a web server. The server does some processing — retrieving data, crunching numbers, talking to various legacy systems — and then returns an HTML page to the client.
An Ajax application eliminates the start-stop-start-stop nature of interaction on the Web by introducing an intermediary — an Ajax engine — between the user and the server. It seems like adding a layer to the application would make it less responsive, but the opposite is true.