A user interface is the part of your program that is visible to a human user. It can be as simple as a command line or as sophisticated as an immersive virtual reality simulator (see Death Dream by Ben Bova). However, in the context of Visual Basic it usually means what is commonly referred to as a Graphical User Interface or GUI which generally consists of one or more Forms that contain text boxes, labels, buttons, picture boxes, etc.
A more common example of a GUI would be a standard EXE(Windows Forms).
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