An axle is a central shaft that connects two wheels, allowing them to rotate together. It plays a crucial role in vehicles, providing support and stability while enabling movement. Axles can be found in various types of vehicles, including cars, trucks, and bicycles, and they come in different designs, such as live axles and dead axles. In addition to vehicles, axles are also used in machinery and equipment, where they help transmit power and motion. The strength and material of an axle are important for its performance, as they must withstand the forces generated during operation. Proper maintenance of axles is essential for safety and efficiency.