Four-color palette

Quick answer：

A four-color palette refers to a set of four colors that are chosen to be complementary and harmonious in a design. It is commonly used in graphic design, fashion, and art. The most famous example of a four-color palette is the CMYK color model, which is used in printing. The four colors in the CMYK model are cyan, magenta, yellow, and black. Another well-known four-color palette is the RGB color model used in digital displays, which uses red, green, blue, and white to create a wide range of colors.