Secondary colors are created when combining two primary hues. In the subtractive color model, secondary colors include red, blue, and green, while in the additive model, they are cyan, magenta, and yellow.

Notice that the subtractive primary colors (cyan, magenta, yellow) become secondary colors in the additive model. Likewise, red, blue, and green are primary colors in the additive model and secondary colors in the subtractive model. Even though these color models work in opposite ways, they're intricately related to one another.