A sketch is a rapidly executed freehand drawing that is not usually intended as a finished work. A sketch may serve a number of purposes: it might record something that the artist sees, it might record or develop an idea for later use or it might be used as a quick way of graphically demonstrating an image, idea or principal.

Questions having the regards the use of sketching usually in designing User Interfaces.

Reference: http://en.wikipedia.org/wiki/Sketch_(drawing)

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