Definition
Hair is the fine, thread-like strands that grow from the skin of mammals, including humans. It's made of a protein called keratin, the same stuff that makes up your nails. π Think of it as a natural covering that provides warmth, protection, and even helps with sensory perception. Unlike fur, which is a denser coat, hair can be more sparse and varied in length and texture. So, hair is essentially nature's way of giving us a customizable head covering.