Question

what is expension card​

Answer 1

a circuit board that can be inserted in a computer to give extra facilities or memory is called expension card

hope it helps

Answer 2

In computing, the expansion card, expansion board, adapter card or accessory card is a printed circuit board that can be inserted into an electrical connector, or expansion slot, on a computer motherboard, backplane or riser card to add functionality to a computer system via the expansion bus