RGB

The RGB color model utilizes the additive model in which red, green, and blue light are combined in various ways to create other colors. The very idea for the model itself and the abbreviation RGB come from the three primary colors in additive light models.
Note that the RGB color model itself does not define what exactly is meant by red, green and blue, so that the same RGB values can describe noticeably different colors on different devices employing this color model. While they share a common color model, their actual color spaces can vary considerably.