What does Automatic Transmission mean?

Automatic transmission (AT), also called auto or self-shifting transmission, is a type of motor vehicle transmission that shifts gears automatically, without requiring the driver to manually select gears. This is in contrast to manual transmission, in which the driver must select the gears manually by moving a gear stick or paddle shifters.

Automatic transmissions use a variety of mechanisms to shift gears, including hydraulics, electronics, and computers. The most common type of automatic transmission is the torque converter automatic transmission, which uses a fluid coupling to transfer power from the engine to the transmission. Other types of automatic transmissions include dual-clutch transmission (DCT), continuously variable transmission (CVT), and automatic manual transmission (AMT).