What Is the Expansion Slot, and How Can I Use It? - How-To Geek

The function of the PCI slot is to allow you expand computer capabilities It is a slot for inserting expansion cards into your computer Less

expansion slots from ISA to PCIe The video I mention at the end about PC motherboards is

expansion slot definition a slot used for some networking or audio expansion cards, it's not used anymore because the functions of a CNR are now found on the motherboard Image: CNR

expansion slot drawing An expansion slot is a hardware interface on a computer's motherboard that allows additional components to be added to the system