what is sli

i was checking out an artical on tom's hardware about the
new nForce4 chip at http://www20.tomshardware.com/motherboard/20041020/nforce4-03.html
and was noticing that the nForce4 sli supports sli and nForce4 ultra doesn't
but don't have a clue what sli is?  does that mean
you could have more than one processor on the motherboard?
someone please clue me in thanks.
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