An axle is a central shaft that connects two wheels, allowing them to rotate together. It plays a crucial role in vehicles like cars and bicycles, providing stability and support. When the wheels turn, the axle helps transfer power from the engine or pedals, enabling movement. In addition to vehicles, axles are also found in various machines and equipment, such as trucks, tractors, and conveyor belts. They come in different sizes and materials, depending on their specific use. Understanding how axles work is essential for anyone interested in mechanics or engineering.