A unicycle is a one-wheeled vehicle that is powered by the rider's balance and pedaling. Unlike a bicycle, which has two wheels, a unicycle requires more skill to ride because it can easily tip over. Riders often use a seat and pedals, and they must learn to balance while moving forward. Unicycles are popular in various activities, including circus performances and extreme sports. Some riders even participate in competitions or join groups like the Unicycling Society of America. With practice, anyone can learn to ride a unicycle and enjoy the unique challenge it offers!