A ring gear is a large, circular gear that is typically used in mechanical systems, such as in automobiles and industrial machinery. It is designed to mesh with smaller gears, known as pinions, to transmit torque and rotational motion. The ring gear is often part of a gear assembly, such as in a differential, where it helps distribute power to the wheels. Ring gears are usually made from durable materials like steel or aluminum to withstand high levels of stress and wear. They can be found in various applications, including gearboxes, wind turbines, and robotics, where precise movement and power transfer are essential for efficient operation.