user interface
US /ˈjuːzər ˈɪntərfeɪs/
UK /ˈjuːzər ˈɪntərfeɪs/

1.
the means by which the user and a computer system interact, in particular the use of graphical displays, menus, and movable icons rather than text typed commands
:
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The new software has a very intuitive user interface.
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Good user interface design is crucial for user satisfaction.