expansion slots and expansion cards

The purpose of expansion slots is to provide a standardized connection interface that allows expansion cards to communicate with the rest of the computer system.

Older motherboards and motherboards that provide for backward capability with older expansion cards might have PCI slots.

39. Expansion Slots and Adapter Cards What is an expansion slot?  An opening, or socket, on the motherboard that can hold an adapter card  With Plug and Play, the computer automatically configures cards and other devices as you install them 39.