clearing yum cache ?

To: For users of Fedora Core releases <fedora-list@xxxxxxxxxx>
Subject: clearing yum cache ?
From: Mehmet Fatih AKBULUT <mfatihakbulut@xxxxxxxxx>
Date: Tue, 6 Dec 2005 18:14:09 +0200
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Reply-to: For users of Fedora Core releases <fedora-list@xxxxxxxxxx>

hi all.
hi can i clear yum cache ?
is an easy way or a command like that ?
Regards.
Bye