DNS --> What exactly is reverse lookup Zones

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From: Hareth (abiheiri_at_hotmail.com)
Date: 06/17/04 

Date: Thu, 17 Jun 2004 10:56:40 -0400

I know the definition o f Rev ookup zones, I even successfully set it up....

But with or without it, I have no idea what difference it made. What is the
the real point of Rlookup & and is it commoly used...