The document discusses the color wheel and color theory. It explains that the color wheel is divided into primary, secondary, and tertiary colors. The primary colors are red, yellow, and blue which can be combined to form the secondary colors of orange, green, and violet. Tertiary colors are made by combining a primary and adjacent secondary color. It also categorizes colors as cool or warm and defines key color terms like hue, intensity, value, tints, shades, and color schemes such as monochromatic, analogous, complementary, split complementary, triadic, and tetradic.