What is a PCIE slot? Important slots on a Motherboard?

pci slotPCIe Slot Structure. All PCIe slots are divided into two parts by a small protrusion in the middle separating them. This is why PCIe expansion cards, such as graphics cards,You can install PCI Express slots in larger slots but not smaller ones. For example, you can install a PCI Express x1 adapter into an x16 slot (but will still