what does the $ as a variable do?

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Author: Michael Havens
Date:  
To: PLUG
Subject: what does the $ as a variable do?
people are reporting a bug in steam. apparently there is a line in it that
is deleting all the personal data all connected read/write media.
this is how the line reads:


rm -rf $STEAMROOT/*


what does the '$' expand too?
:-)~MIKE~(-:
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