Ball bearings are small, spherical objects made of metal or ceramic that help reduce friction between moving parts in machines. They are commonly used in various applications, such as bicycles, cars, and industrial equipment, allowing for smoother and more efficient movement. By enabling parts to roll instead of slide against each other, ball bearings help improve performance and extend the lifespan of machinery. The basic design of a ball bearing includes an inner ring, an outer ring, and a set of balls that fit between them. As the inner ring rotates, the balls roll within the grooves of the rings, minimizing wear and tear. This simple yet effective mechanism is essential in many everyday devices.