What is NAT?

Can someone please (without asking me to Google) explain simply and
plainly what NAT is?

Is it, basically, the mechanism that my router uses to forward TCP or
UDP packets that come in to my router from the ISP to a specific machine
on my internal network (and vice-versa)?
--
% Randy Yates % "With time with what you've learned,
%% Fuquay-Varina, NC % they'll kiss the ground you walk
%%% 919-577-9882 % upon."
%%%% <yates@xxxxxxxx> % '21st Century Man', *Time*, ELO
http://home.earthlink.net/~yatescr
.

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