Color matching and tone refer to the process of selecting colors that complement each other harmoniously. In design and fashion, understanding color theory helps to create visually appealing combinations. The three primary colors (red, blue, yellow) can be mixed to create secondary colors (green, orange, purple) and tertiary colors. Tones are variations of a base color, which can be lightened or darkened to achieve different effects. In interior design, color matching and tone play a crucial role in creating a cohesive and aesthetically pleasing space.