Rotary bearings are mechanical components that allow for smooth rotation between two parts. They reduce friction and wear by providing a stable surface for moving parts, which is essential in various machines and equipment. Common types include ball bearings and roller bearings, each designed for specific load and speed requirements. These bearings are widely used in applications such as electric motors, automobiles, and industrial machinery. By enabling efficient movement, rotary bearings enhance performance and longevity, making them crucial in engineering and manufacturing processes. Proper selection and maintenance of these bearings can significantly impact overall system efficiency.