Monochromatic light and dark colors

Quick answer：

Monochromatic light and dark colors refer to shades within a single color family that vary in lightness or darkness. This concept is often used in design, fashion, and art to create harmony and depth. In design, it involves selecting different tones of the same hue to create a cohesive look. In fashion, it is a popular trend that allows for a sleek and polished appearance. In art, monochromatic color schemes can evoke a range of emotions and can be used to focus attention on other elements in a composition.