Counter-shading is a form of camouflage that helps organisms blend into their surroundings. Counter-shading is a coloration pattern where the parts of an animal that are usually in shadow are lighter in colour, and the parts that are usually in light are darker. This makes the animal more difficult to detect by reducing the contrast between the animal and its background.
Chameleons do not exhibit counter-shading, but they do have active camouflage that allows them to change their colour to match their environment. This pattern is used by many animals, including fish, birds, reptiles, mammals, etc.