Four color color scheme

Quick answer：

A four-color color scheme typically refers to a design or artistic arrangement that utilizes four different colors. It can be used in various fields such as graphic design, fashion, interior design, and painting. The concept can range from a simple combination of four distinct hues to a more complex palette that includes tints, shades, and tones. In some cases, 'four-color' may also refer to the CMYK color model, which is widely used in printing to create full-color images.