What is the difference between automatic and manual transmissions?

Automatic transmissions shift gears automatically while manual transmissions require the driver to shift gears manually using a clutch pedal and gear shift. Automatic transmissions use a torque converter to transfer power from the engine to the transmission while manual transmissions use a clutch to engage and disengage the engine from the transmission. Automatic transmissions are typically easier to operate and require less driver input, while manual transmissions offer more control and better fuel efficiency.