A dual clutch transmission, commonly abbreviated to DCT[1] (sometimes informally referred to as a twin-clutch gearbox, double clutch transmission, or similar variations thereof), is a differing type of semi-automatic or automated manual automotive transmission. It utilises two separate clutches[2] for odd and even gear sets. It can fundamentally be described as two separate manual transmissions (with their respective clutches) contained within one housing, and working as one unit.[1][3] They are usually operated in a fully automatic mode, and many also have the ability to allow the driver to manually shift gears,[2] albeit still carried out by the transmission's electro-hydraulics.