i386,i586,i686

To: "For users of Fedora Core releases" <fedora-list@xxxxxxxxxx>
Subject: i386,i586,i686
From: "Kumara" <kumara.jayaweera@xxxxxxxxx>
Date: Fri, 18 Feb 2005 19:22:25 +0300
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Reply-to: Kumara <kumara.jayaweera@xxxxxxxxx>, For users of Fedora Core releases <fedora-list@xxxxxxxxxx>

Hi all,
i'm not clear of what is
i386
i586
i686 etc..
could somebody brief me
Thanks
Mohan