A ball bearing is a mechanical component that reduces friction between moving parts. It consists of a series of small, spherical balls placed between two smooth surfaces, allowing for smooth rotation or linear movement. This design helps distribute weight and enables machinery to operate more efficiently. Ball bearings are commonly used in various applications, including bicycles, motors, and industrial machinery. They come in different sizes and materials, depending on the specific requirements of the equipment. By minimizing friction, ball bearings enhance performance and extend the lifespan of machines.