What does the logic board do?

What does the logic board do? I just got my MacBook Pro back from Apple, where I had sent it to fix the fact that it wasn't displaying video. I thought it was probably the video card (right?) but in fact they said it was the logic board. I don't know what this is.
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Guest [Entry]

"It's the motherboard! Apple calls it the logic board for some reason.
The term came around a while back, when apple still used different hardware to windows machines, and it's sort of stuck."