An input/output connector to which you attach a joy stick or other game device to your computer. It is typically a 15-pin socket on the back of a PC.

n. In IBM personal computers and compatibles, an I/O port for devices such as joysticks and game paddles. The game port is often included with other I/O ports on a single expansion card. See also Game Control Adapter.

The game port is the traditional connector for video game input devices on an x86-based PCs. The game port is usually integrated with a PC I/O or sound card, either ISA or PCI, or as an on-board feature of some motherboards.