|Noun||1.||user interface - (computer science) a program that controls a display for the user (usually on a computer monitor) and that allows the user to interact with the system|
|user interface - The aspects of a computer system or program which can be seen
(or heard or otherwise perceived) by the human user, and the
commands and mechanisms the user uses to control its operation
and input data.|
A graphical user interface emphasises the use of pictures for output and a pointing device such as a mouse for input and control whereas a command line interface requires the user to type textual commands and input at a keyboard and produces a single stream of text as output.
See also user interface copyright.