A unicycle is a one-wheeled vehicle that is propelled by the rider's pedaling. It consists of a single wheel, a frame, and pedals, making it distinct from bicycles, which have two wheels. Unicycles are often used for recreation, performance, and even transportation in some cases. Riding a unicycle requires balance and coordination, as the rider must maintain stability while pedaling. Many people enjoy learning to ride unicycles as a fun challenge, and some even participate in unicycle sports or competitions.