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The Free On-line Dictionary of Computing (foldoc)

Red, Green, Blue. The three colours of light which can be
mixed to produce any other colour. Coloured images are often
stored as a sequence of RGB triplets or as separate red, green
and blue overlays though this is not the only possible
representation (see {CMYK} and {HSV}). These colours
correspond to the three "guns" in a colour {cathode ray tube}
and to the colour receptors in the human eye.

Often used as a synonym for colour, as in "RGB monitor" as
opposed to {monochrome} (black and white).