Pigmentation refers to the coloring or color variations in an individual's skin, hair, fur or feathers due to the presence of pigments. Pigments are natural substances that give color to living organisms and are responsible for their appearance. In humans, pigmentation can be influenced by genetics, hormones, and environmental factors such as sun exposure. Common examples of pigmentation include skin tone (light or dark), hair color (blonde, brunette, redhead) and freckles on the face. Pigmentation is also used to describe the coloring in plants, animals, and other organisms.