A dedicated socket in the computer for a mouse. Today, mice plug into the USB port, but in the past, mice plugged into a PS/2 connector, which is a 6-pin Mini-DIN socket. On the first desktop PCs, the mouse connected via the serial port, but the PS/2 port was subsequently used. On a Macintosh, the Apple Desktop Bus (ADB) connector was used. See PC input/output and USB.|
Still found on many PCs, these mouse ports were widely used. Today, like most peripheral devices, the mouse connects via USB.