Okay - quick definition .
Quote:
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Short for Asynchronous JavaScript and XML, it is a term that describes a new approach to using a number of existing technologies together, including the following: HTML or XHTML, Cascading Style Sheets, JavaScript, the Document Object Model, XML, XSLT, and the XMLHttpRequest object. When these technologies are combined in the Ajax model, Web applications are able to make quick, incremental updates to the user interface without reloading the entire browser page.
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So you could have a button, and when that button is clicked, instead of refreshing the whole entire page, it will only update the part that has been changed. An example of this would be Gmail, it will update your inbox whenever you get new mail, without doing a refresh
AJAX - Asynchronous JavaScript And XML
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