A hair trimmer is a grooming device used to cut, shape, or maintain hair with precision. It features sharp, adjustable blades for trimming hair to various lengths. Trimmers are commonly used for beard, mustache, neck, and sideburn grooming. Many models come with multiple comb attachments for customized cutting. Cordless versions offer flexibility and are powered by rechargeable batteries. They are compact, lightweight, and easy to handle for home or professional use. Some trimmers include waterproof designs for convenient cleaning. They provide a quick, clean, and mess-free grooming experience. A hair trimmer is essential for maintaining a neat and polished look.