In the context of color theory, what is the “complementary color” of a given color?

The opposite color

Complementary colors, located directly opposite each other on the color wheel, are fascinating not only for their visual contrast but also for their psychological interaction. When these colors are used together, they produce a vibrant effect without blending into gray, unlike randomly mixed colors. This dynamic is essential in art and design, where maximal contrast is sought to attract the eye, create balance, or evoke specific emotions. For example, the opposition between blue and orange can evoke a sense of warmth and cold simultaneously, illustrating how contrasts of complementary colors can visually enrich a piece and stimulate an emotional response from the viewer.