When working with large data sets AJAX is essential to efficiency and saving time. It is the art of exchanging data with a server, and updating parts of a web page - without reloading the whole page.
This allows your web based application to behave like a desktop based program without any of the cost or overhead associated with licensing and deployment of standard client based applications
AJAX is the use of the XMLHttpRequest object to communicate with server-side scripts. It can send as well as receive information in a variety of formats, including JSON, XML, HTML, and even text files. AJAX's most appealing characteristic, however, is its "asynchronous" nature, which means it can do all of this without having to refresh the page. This lets you update portions of a page based upon user events.
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