What does having more than 1 font in CSS mean?

Posted by Doug on Stack Overflow See other posts from Stack Overflow or by Doug
Published on 2010-05-01T23:22:57Z Indexed on 2010/05/01 23:27 UTC
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font:0.5em Georgia,"Times New Roman",Sans-Serif;

What does this mean when someone sets 3 different fonts? Also what is the em mean?

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