A boundary acroSS which two SyStemS communicate. An interface might be a hardware connector uSed to link to other deviceS, or it might be a convention uSed to allow communication between two Software SyStemS. Often there iSSome intermediate component between the two SyStemS which connectS their interfaceS together. For example, two EIA-232 interfaceS connected via a Serial cable. See alSo graphical uSer interface, {Application Program Interface}. (1996-05-22)