what are pci slots on a motherboard

AMBIL SEKARANG

Motherboards with PCI Expansion Slot for sale | eBay UK

What exactly is a "PCI Express card slot (physical link width x16; negotiable link width x4, x1)" ... The motherboard has 3 PCI Express slots ...

What the slots on the back of tower PC case are for?

SirAdelaide, I'm not interested in ISA/PCI/PCI-e/etc slots on motherboard and relating cuttings on the back of the PC case.

Function of expansion slots in a computer case? : r/buildapc

What type of expansion slots are on my motherboard?