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An automatic gearbox, also known as an automatic transmission or auto gearbox, is a type of gearbox that automatically changes gear ratios as the vehicle moves, without the need for the driver to manually shift gears.

An automatic gearbox typically uses a hydraulic system to control the shifting of gears, and relies on sensors to determine the appropriate gear ratio based on factors such as vehicle speed, engine speed, and throttle position. The gearbox may also be equipped with a torque converter, which allows the engine to continue running even when the vehicle is stopped, and helps to smooth out gear changes.

Automatic gearboxes offer several advantages over manual gearboxes, including ease of use, smoother gear changes, and improved fuel efficiency in some cases. They are commonly found in modern cars, trucks, and other vehicles, and are available in a variety of configurations including traditional hydraulic systems, continuously variable transmissions (CVTs), and dual-clutch transmissions (DCTs).