RGB

n. primary colors of light used to create color pictures in television screens and computer monitors

The RGB color model is an additive model in which red, green, and blue (often used in additive light models) are combined in various ways to reproduce other colors. The name of the model and the abbreviation ‘RGB’ come from the three primary colors, red, green, and blue and the technological development of cathode ray tubes which could display color instead of a monochrome phosphoresence (including grey scaling) such as black and white film and television imaging.
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Abbreviation for red-green-blue. Pertaining to the use of three separate signals to carry the red, green, and blue components, respectively, of a color video image. (188 ) Note: The image is not NTSC-encoded; RGB typically results in higher resolution than that specified by the National Television Standards Committee.

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).

RGB , red-green-blue