The user interface is the area where the user and an application
interact. Any tool or machine has a user interface that is designed
according to the user's needs.
A user interface can be as simple as a set of buttons, like
those on a telephone or video recorder. In the computer world, a
user interface can include a keyboard, a pointing device, and the
items that appear on a display screen. The user interface, then,
is the ensemble of hardware and software that lets a user and a
computer communicate.
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