WINDOW PORT, VIEWPORT
A world-coordinate area selected for display is named a window. a region on a display device to which a window is mapped is named a viewport. The window defines what's to be viewed; the viewport defines where it's to be displayed.
Windows and viewports are rectangles in standard position, with the rectangle edges parallel to the coordinate axes.
Generally, the mapping of a component of a world-coordinate scene to device coordinates is said as a viewing transformation. Sometimes the two-dimensional viewing transformation is solely said because the window-to-viewport transformation or the windowing transformation. But, in general, viewing involves over just the transformation from the window to the viewport.
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