A comb is a tool used for grooming and styling hair. It usually has a row of teeth that can be used to straighten and untangle hair. A brush is also a grooming tool, but it is typically used for smoothing and shaping hair. It has a handle and a head with bristles or fibers that are used to sweep through the hair. Both combs and brushes can be made from a variety of materials, such as plastic, wood, or metal. They are available in different sizes and styles to suit different hair types and purposes.