What are complementary colors?

Complementary colors are defined as colors that are located directly opposite one another on the color wheel. This opposing relationship means that complementary colors create a strong contrast when paired together, which can be visually striking and effective in design. When used in a composition, these colors enhance each other and can make elements stand out. For example, red and green are complementary colors; when used together, they amplify one another's presence.

The other choices describe different color relationships and techniques in design but do not accurately define complementary colors. Blending colors or using shades of the same hue refers to analogous colors or color harmony, which focuses on how colors work together more as a cohesive group. Hence, focusing on the position on the color wheel is key to understanding the concept of complementary colors, making the first option the correct choice.