A drive gear is a mechanical component used in various machines to transmit power and motion. It typically consists of a toothed wheel that meshes with another gear, allowing rotational force to be transferred from one part of a machine to another. Drive gears are essential in systems like automobiles, bicycles, and industrial machinery. These gears come in different sizes and shapes, depending on their specific application. The arrangement and ratio of drive gears can affect the speed and torque of the output, making them crucial for optimizing performance in devices such as watches and conveyor belts.