A blow dryer, also known as a hair dryer, is an electrical device used to dry and style hair. It works by blowing warm or hot air over wet hair, which helps evaporate moisture quickly. Most blow dryers have adjustable heat and speed settings, allowing users to customize their drying experience. Blow dryers typically come with various attachments, such as diffusers and concentrators, to enhance styling options. They are commonly used in homes and salons, making them a popular tool for achieving different hairstyles. Safety features, like automatic shut-off, are often included to prevent overheating.