There are three types of primary color forms. A hue is a pure color that is not mixed with anything else. Black and white are the other two primary color forms. Mix any two or three of these elements together and you create a secondary color form.

When you mix black and white together, the result is gray. Mix black with a hue and a shade is created. Stir a little white into a hue and the mixture is called a tint. And finally, if you take the gray which you've already mixed and add it to a hue, you will have a tone.