Shafts are long, cylindrical objects that are commonly used in machinery and engineering. They serve as a means to transmit power or motion from one part of a machine to another. For example, in a car, the drive shaft transfers power from the engine to the wheels, allowing the vehicle to move. Shafts can be made from various materials, including metal, plastic, or composite materials, depending on their intended use. They can be solid or hollow and may have different diameters and lengths. In addition to automotive applications, shafts are also found in industrial equipment, turbines, and conveyor systems.