expansion slot | expansion slot

Character Slot Expansion Coupon: Untradeable, 7-day duration.

An expansion slot is a bus slot or expansion port found on the motherboard of a computer. It performs as a socket on the motherboard.

An expansion slot is a place in a computer where a circuit board or expansion card can be inserted to expand the computer's capabilities. The boards inserted into the expansion slots are called expansion boards, expansion cards, cards, add-ins, and add-ons.