Interface

noun

1. A surface forming a common boundary between adjacent regions, bodies, substances, or phases.
2. A point at which independent systems or diverse groups interact.
4. A system of interaction or communication between a computer and another entity such as a printer, another computer, a network, or a human user.
5. A device, such as a cable, network card, monitor, or keyboard, that enables interaction or communication between a computer and another entity.