Wind-up toys are small mechanical toys that move when you twist a key or turn a knob. Inside, they have a spring mechanism that stores energy. When released, the energy makes the toy walk, spin, or perform other fun actions. These toys come in various shapes, like animals, cars, or even robots, and are often brightly colored to attract attention. Many people enjoy collecting wind-up toys because they remind us of simpler times. They can be found in toy stores, flea markets, and online shops. Some collectors even seek out vintage wind-up toys from the mid-20th century, which can be quite valuable and nostalgic.