What are seven different kinds of color schemes?

Seven different kinds of color schemes include monochromatic, which uses variations of a single color; analogous, which combines colors that are adjacent on the color wheel; and complementary, featuring colors that are opposite each other. Other schemes include split-complementary, which takes one base color and combines it with the two colors adjacent to its complementary color; triadic, which uses three evenly spaced colors on the color wheel; tetradic, which involves two complementary color pairs; and achromatic, which consists of shades of gray without any hue. Each scheme creates different visual effects and moods.