Hair or fur is a natural covering found on many mammals, including humans. It is made of a protein called keratin and serves various functions, such as insulation, protection, and sensory perception. Hair can vary in texture, color, and length, depending on the species and environmental conditions. Fur is typically denser and softer than hair, providing better insulation for animals in colder climates. Different animals, like dogs and cats, have unique fur types that help them adapt to their surroundings. Both hair and fur can also play a role in communication and camouflage within their habitats.