(Please forgive the weird spacing, I took this from the web)
The color wheel is an important piece of basic of color design. It is literally a wheel with twelve colors on it made up of primary, secondary and tertiary colors.
Primary Primary colors are colors that cannot be created by mixing with other colors. These are often referred to as the true colors, because you need them to create all the other colors. They are:
Secondary colors are created by mixing primary colors. They are:
Tertiary colors are colors created by mixing a primary and secondary color. They are: