Color changing refers to the ability of an object or material to alter its color in response to various stimuli. This phenomenon can occur due to temperature changes, light exposure, or chemical reactions. For example, some thermochromic materials change color when heated, while photochromic materials adjust their color when exposed to sunlight. In nature, many organisms exhibit color changing as a survival mechanism. Chameleons are well-known for their ability to change color to blend in with their surroundings, helping them avoid predators. Similarly, some octopuses can change their skin color and texture to communicate or camouflage themselves in their environment.