A wind-up toy is a type of toy that works by winding a small key or knob to store energy in a spring inside the toy. Once wound, the toy can move, make noise, or perform actions as the stored energy is released. These toys do not require batteries, making them simple and environmentally friendly. Wind-up toys come in many forms, such as animals, cars, or robots, and are often made from plastic or metal. They are popular for their simple yet entertaining actions, helping children develop motor skills and an understanding of cause and effect.

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