The balls are held within cages and rotate along the inner ring and raceway, which is located on the inner diameter of the outer ring.
Ball bearings are packed with power. They allow two surfaces to rotate independently. Friction is reduced by providing smooth inner and outer raceways for the balls to roll within. These balls are then able to support the application load, with a smooth rotating action.
Bearings are found in everything from fans and refrigerators to cars and airplanes.