A hair dryer is an electrical device used to dry and style hair by blowing warm or hot air. It typically consists of a motor, a fan, and a heating element. When turned on, the fan draws in air, which is then heated and directed through a nozzle. Hair dryers come with various settings for heat and speed, allowing users to customize their drying experience. Most hair dryers also include attachments, such as diffusers and concentrators, to help achieve different styles. They are commonly used in homes and salons, making them an essential tool for personal grooming and hair care.