What does the question mark at then end of a css file mean/do?

Posted by Bob Dylan on Stack Overflow See other posts from Stack Overflow or by Bob Dylan
Published on 2010-04-14T00:25:30Z Indexed on 2010/04/14 0:33 UTC
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I've noticed that on some websites (including SO) the link to the CSS will look like:

<link rel="stylesheet" href="http://sstatic.net/so/all.css?v=6638">

I would say its safe to assume that ?v=6638 tells the browser to load version 6638 of the css file. But can I do this on my websites and can I include different versions of my CSS file just by changing the numbers?

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