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Automatic transmission is a type of motor vehicle transmission that can automatically change gear ratios as the vehicle moves, freeing the driver from having to shift gears manually. This type of transmission utilizes a torque converter to smoothly transfer power from the engine to the wheels, allowing for seamless acceleration and deceleration without the need for clutch control. Automatic transmissions offer convenience and ease of use for drivers, particularly in stop-and-go traffic or hilly terrain.