How the software program acts as an interface between the user and computer
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The features of a computer system which allows the user to interact with it. A user interface, also sometimes called a human-computer interface, comprises both hardware and software components. It handles the interaction between the user and the system. ... graphical user interface (GUI).. The user interface allows the user to communicate with the operating system. Also see GUI. software interface - the languages and codes that the applications use to communicate with each other and with the hardware.An API specification can take many forms, but often includes specifications for routines, data structures, object classes, variables, or remote calls.API is the way for an application to interact with certain system/application/library/etc. For example, there are API's for OS (WinAPI), API's for other applications (like databases) and for specific libraries (for example, image processing), etc. APIs are usually developed in a form consumable by a client application.