An automatic gearbox, also known as an automatic transmission or self-shifting gearbox, is a type of motor vehicle transmission that can automatically change gears for the driver. This means that instead of having to manually shift through each gear, the car's computer system takes care of this task, making it easier and more convenient for drivers to operate their vehicles. Automatic gearboxes are commonly found in cars, vans, and light trucks, as they offer a smooth driving experience and can help improve fuel efficiency by optimizing engine power at different speeds.