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Purpose of using AJAX

The main purpose of using AJAX is to asynchronously get the information from the server and update only that area of the web page where this information fetched needs to be displayed, avoiding refresh of the entire page. The other advantage of this is, the web page can hold minimal required data and retrieve rest as needed based of events.

How is all this possible.

Its possible by writing a JavaScript code in your web application, which uses XMLHttpRequest object to communicate with the server and get the data asynchronously.

Following figure shows the interaction.

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