2 gpu slot motherboard | 2 gpu slot motherboard

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A GPU provides the fastest graphics processing, and for gamers, the GPU is a must-have, stand-alone card plugged into a PCI Express (PCIe) slot on the motherboard.

what is a gpu dual slot? is there also a single slot gpu, if so what are the differences? ... it's how many "slots" it takes on the motherboard/case, every PCI ...