In computers, a slot, or expansion slot , is an engineered technique for adding capability to a computer in the form of connection pinholes (typically, in the range of 16 to 64 closely-spaced holes) and a place to fit an expansion card containing the circuitry that provides some specialized capability, such as video ...

An expansion slot is a socket on a computer motherboard that allows you to add additional components to your system. These slots are used to expand the capabilities of your computer and can be used to add new functionality to your system.