Roller bearings are mechanical components that reduce friction between moving parts. They consist of cylindrical rollers placed between two surfaces, allowing for smooth rotation or linear motion. This design helps distribute loads evenly, enhancing the efficiency and lifespan of machinery. These bearings are commonly used in various applications, including automobiles, industrial machinery, and electric motors. By minimizing wear and tear, roller bearings contribute to improved performance and reliability in equipment, making them essential in many engineering and manufacturing processes.