An automatic gearbox is a type of transmission that automatically changes the vehicle's gears without the driver needing to manually shift them. This system uses a complex set of components, including hydraulic systems and electronic controls, to determine the optimal gear based on speed and engine load. Automatic gearboxes provide a smoother driving experience, especially in stop-and-go traffic, as they eliminate the need for clutch operation. Common types include continuously variable transmissions (CVTs) and dual-clutch transmissions (DCTs), each offering different benefits in terms of performance and fuel efficiency.