Primary colors are the foundation of all other colors. In traditional color theory, the primary colors are red, blue, and yellow. These colors cannot be created by mixing other colors together, but they can be combined in various ways to produce a wide range of other colors. In the context of additive color mixing, used in digital screens, the primary colors are red, green, and blue. When these colors of light are mixed together in different intensities, they create all other colors, including white when combined at full intensity.