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Coloration refers to the way in which living organisms are colored. This coloration can serve a variety of purposes, including camouflage, attracting mates, warning predators, or aiding in thermoregulation. The specific pigments and structures responsible for an organism's color vary widely across the animal and plant kingdoms.

In animals, coloration is often achieved through the presence of pigments like melanin, which produces black, brown, and some red and yellow hues, or carotenoids, which are responsible for bright reds, oranges, and yellows. Structural coloration, on the other hand, arises from the physical interaction of light with microscopic structures on the surface of the organism, leading to iridescent or metallic sheens. Examples include the vibrant blue of a peacock's feather or the shimmering scales of a butterfly's wing.

The evolutionary pressures that drive the development of specific colorations are diverse. Cryptic coloration, or camouflage, helps prey animals avoid detection by predators, while aposematic coloration, or warning coloration, signals to potential predators that the organism is toxic or unpalatable. Sexual selection also plays a significant role, with bright and elaborate colorations often used by males to attract females. In some cases, coloration can also assist in regulating body temperature, with darker colors absorbing more heat and lighter colors reflecting it.