A sketch (ultimately from Greek σχέδιος – schedios,

"done extempore"[1][2][3]) is a rapidly executed

freehand drawing that is not usually intended as a

finished work.[4] 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 principle.

Sketches can be made in any drawing medium. The term is

most often applied to graphic work executed in a dry

medium such as silverpoint, graphite, pencil, charcoal

or pastel. But it may also apply to drawings executed

in pen and ink, ballpoint pen, water colour and oil

paint. The latter two are generally referred to as

"water colour sketches" and "oil sketches". A sculptor

might model three-dimensional sketches in clay,

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https://en.wikipedia.org/wiki/Sketch_...)