Ajax is shorthand for Asynchronous JavaScript + XML. It's a combination of widespread web technologies like XHTML and CSS and the esoteric XMLHttpRequest object which enables web clients to retrieve XML data in the background. When cleverly tied together with JavaScript, the results can be impessive.
Jesse James Garrett has a great article on Ajax here. (His company, Adaptive Path is taking credit for coining the term.)
You can see Ajax at work at two new Google sites – Google Suggest and Google Maps.
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