A hand dryer is an electric device used to dry hands after washing. It works by blowing warm air onto wet hands, helping to evaporate the moisture quickly. Hand dryers are commonly found in public restrooms, schools, and restaurants, providing a convenient alternative to paper towels. There are two main types of hand dryers: jet dryers and warm air dryers. Jet dryers use high-speed air to dry hands in a matter of seconds, while warm air dryers take a bit longer and use a gentler airflow. Both types aim to promote hygiene and reduce waste associated with disposable paper towels.