Ajax (web technology)/Definition
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Asynchronous JavaScript and XML (AJAX) is a Javascript programming technique that allows Javascript running in a local web browser to fetch content from a web server in the background. The Javascript then places the newly fetched information into the web page without reloading the entire page. Use of XHTML instead of the more relaxed HTML means that Javascript can use the standardized XHTML DOM to correctly identify the sections of the web page to be updated. Recent progress in Javascript standards, and browser support of those standards, has made Ajax'd web pages more common. The term Ajax (also written as AJAX) was coined by Jesse James Garrett in an article called "Ajax: A New Approach to Web Applications