Hair trimmers are handheld grooming tools designed to cut and shape hair with precision. They typically feature sharp blades that can be adjusted for different lengths, making them suitable for various hair types and styles. Many trimmers are cordless, allowing for easy maneuverability, and some come with attachments for added versatility. These devices are commonly used for maintaining facial hair, such as beards and mustaches, as well as for trimming hair on the head. Popular brands like Philips and Wahl offer a range of models, catering to both professional barbers and home users.