When many people think of a transmission system, they simply think of two kinds: automatic and manual. So, it's very common to wonder what an automated manual transmission is, sometimes also referred to as a semi-automatic transmission in the world. Here is a breakdown of each type to explain the difference:
Manual Transmission: With a manual (aka standard) transmission system, the driver manually shifts through the gears using a gear selector (aka stick) and a clutch pedal. This system is also sometimes referred to as a stick shift.
Automated Manual Transmission: This transmission system, sometimes referred to as a direct shift gearbox or sequential manual gearbox, also uses a mechanical clutch. But this clutch is not controlled by pushing the clutch pedal like in a traditional manual transmission system. In this system, the clutch is fully automated through hydraulic or electronic controls, like paddles/buttons or a gear selector. These gear selectors are usually found on the steering wheel or in the form of additional options of movement for the gear stick (usually labeled with a plus and minus sign).