See http://en.wikipedia.org/wiki/Expansion_card
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A slot card is a modular expansion card, which can be inserted into a free expansion slot in a PC computer. Most popular types of slot cards are graphic cards, sound cards, TV tuner cards and video editing cards.
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Some types of slot games are Straight Slots that pay on the standard pay table,Progressive Slots that the pot goes up per play, and Bonus Game Slots that give spins for no extra money.
Slot cars are miniature vehicles that run under their own power on tracks with a groove, or slot, guiding their motion. There are three types based on size, those built at 1:24 scale, 1:32 scale, and HO models which are built at a scale ranging from 1:64 to 1:87.
The slot is just dead space. You can place your gum or cigs there. Also, if wanted, you can remove the radio and that slot allows you to use a bigger radio. ie. Nav sytem or CD change types.
PCIe (PCI Express)
The expansion slot is the socket on the motherboard that can hold an adapter card. There are different types of expansion slots (pci, pcie, pciex16) so you need to check that the expansion is the same kind as the adapter card.
4 Slot types and 6 possible configurations.
Type III