An opening in a computer
where you can insert a printed circuit board
. Slots are often called expansion slots
because they allow you to expand the capabilities of a computer
. The boards
you insert in expansion slots are called expansion boards
or add-on boards
Do not confuse slots with bays. Bays are sites within the computer where you can install disk drives. Typically, slots are in the back of the computer and bays are in the front.