Interface An interface is (part of) a program or a device connecting two entities. These entities can be programs, networks, devices or users. A user interface, for instance, is part of a program that connects a computer with a user. A browser is an example of a program offering a graphical user interface to the World Wide Web on the Internet. An electrical connector, like a plug in a socket, is an example of a device that acts as an interface between two devices.
