User can interact with the operating system through graphical interface rather than typing commands in a prompt as in Linux. Hence Windows is considered primarily as a GUI based system though there is support for command prompt also.
The Brainliest Answer!
GUI stands for Graphical User Interface   Windows uses graphics , text and icons and pictures to communicate and interact with the user so it is known as GUI operating system . 
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brother I need a question is Why Windows are khown as GUI. .. not I need GUI definition. ... if u find this so I will make it brainliezt answer. . surely ok ..
edited :)
thanks brother it's really brainliest anwser :)
thanks brother it's really brainliest anwser