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A blow dryer is a handheld electrical device used for drying and styling hair by producing a stream of hot air. It typically consists of a motor-driven fan and a heating element that work together to blow out warm air. Blow dryers are commonly used in salons and households to quickly dry wet hair, add volume, and create various hairstyles. They come in a variety of sizes, designs, and features to cater to different hair types and styling needs.