A unicycle is a one-wheeled vehicle that is powered by the rider's pedaling. Unlike bicycles, which have two wheels, unicycles require balance and coordination to ride. They are often used for fun, exercise, or even performance in circus acts. Riders can perform tricks and stunts, showcasing their skills and balance. Unicycles come in various styles, including freestyle for tricks, mountain unicycles for off-road riding, and giraffe unicycles, which are taller and used for performances. Learning to ride a unicycle can be challenging, but with practice, many people find it rewarding and enjoyable.