The RGB colour model is an additive colour model in which red, green and blue light are added together in various ways to reproduce a broad array of colors. The name of the model comes from the initials of the three primary colors, red, green and blue. RGB is used in electronic systems such as televisions and computers.
CMYK
CMYK stands for cyan, magenta, yellow and key(key is black). The difference between RGB and CMYK is With the CMYK colour mode, all of the colours are subtractive and therefore, the more colours you add together, the darker the colours are going. The CMYK colour model is used for offset printing for full colour documents because many printers use these 4 colour inks.
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