Interface

1) The point at which independent systems or device groups interact. The devices, rules or conventions by which one component of a system communicates with another. 2) The part of a program that defines constants, variables, and data structures, rather than procedures. 3) The equipment that accepts electrical signals form one part of a computer system and renders them into a form that can be used by another part. 4) Hardware or software that links the computer to a device. 5) To convert signals from one form to another and pass them between two pieces of equipment.