A gear drive is a mechanical system that uses gears to transmit power and motion between different parts of a machine. Gears are toothed wheels that interlock, allowing them to transfer rotational force efficiently. This system is commonly used in various applications, such as automobiles, industrial machinery, and bicycles, to change speed, torque, or direction of movement. Gear drives can be classified into different types, including spur gears, bevel gears, and worm gears, each serving specific functions. They are known for their reliability and ability to handle heavy loads, making them essential components in many mechanical systems. Proper lubrication and maintenance are crucial for their longevity and performance.