If you look on a basic color wheel you will see that he is separated on 12 parts (colors): primary, secondary and tertiary colors and their variations in brightness. With Red on top circle of color consists of three primary colors: Red, Yellow and Blue. Those three colors close triangle in a circle of colors. Three secondary colors are: Orange, Purple and Green. They became by mixing primary colors and in a circle of color they are between them closing another triangle. Tertiary colors who are result of mixing primary and secondary colors are: Red orange, Yellow orange, Yellow green, Blue green, Blue purple and Red purple.
Complementary colors-if you look the circle of color, the color that is diagonally opposite of one color is compliment of that color. Complementary couples are: Red-Green, Blue-Orange, and Yellow-Purple. Complementary colors conflict each other because none contains no small part of the other-so when they are together in one place both strongly emphasizes.