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Asynchronous Javascript And XML. It's a way of doing things with webpages, mainly submitting and receiving data, without refreshing the page. Think about GMail. The functionality I'm referring to allows you to use the quick reply box and submit, and it automatically posts the post without having to refresh the page. This saves the site bandwidth as it isn't having to resend everything on the page, just the little bit that changes.
Basically, it makes the web more like a real application. It's pretty cool technology.
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"Good people do not need laws to tell them to act responsibly, while bad people will find a way around the laws."
--Plato
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