The combination of three adjacent colors

Quick answer：

The combination of three adjacent colors in color theory refers to using colors that are next to each other on the color wheel. This creates a harmonious and cohesive look. For instance, in a primary color palette, one could use red, orange, and yellow. The key is to choose hues that complement each other and create a balanced composition. This technique is often used in design, art, and fashion to evoke specific emotions or to create a certain atmosphere.