CMYK is a subtractive colour model used within colour printing as well as a term used to describe the printing process itself. CMYK refers to the four different inks used in this model of printing - cyan, magenta, yellow and black. The 'K' stands for 'key' in that the cyan, magenta and yellow printing plates are aligned with the black key plate, as well as the fact that black is the colour typically printed first. This colour model works by masking colours on a lighter background - ordinarily white - which is what makes the process subtractive in that the inks reduce brightness from the white.
The RGB colour model, on the other hand, is an addictive model of colour whereby red, green and blue light are added together in numerous ways to reproduce a wide range of colours. RGB refers to the initials of the three primary colours used in this model - red, blue and green. Its main purpose and function is for representing and displaying images within electronic systems, for example computers and televisions.
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