[racket] What are sandboxes used for?

From: Harry Spier (vasishtha.spier at gmail.com)
Date: Sat Feb 11 23:46:33 EST 2012

Would it be possible for someone to briefly explain what sandboxes are
used for.  The documentation Racket Reference 13.11 explains what they
do, but could someone explain where you would use them.

Thanks,
Harry Spier

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