It is a world coordinate. It is a region which is used for displaying an object.
A viewport is considered as a device coordinate after it got normalized. It is a part of a screen in which object requires to display. Basically, world coordinate gets mapped into device coordinate. So that an object gets fitted in respective to a viewport.
Window to viewport transformation
It is the process of transforming world coordinate in respective to device coordinate. Usually, the size of a mapped object in the viewport is smaller than a window, but it can be possible to have a greater size than the Window.
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