Hand dryers are devices used to dry hands after washing. They work by blowing warm air onto wet hands, helping to evaporate the moisture quickly. Hand dryers are commonly found in public restrooms, schools, and offices, providing a convenient alternative to paper towels. There are two main types of hand dryers: jet dryers and traditional warm air dryers. Jet dryers use high-speed air to dry hands in a shorter time, while traditional dryers take a bit longer but are often quieter. Both types aim to promote hygiene and reduce waste associated with disposable paper towels.