An automatic transmission is a type of vehicle transmission that automatically changes the gear ratios as the vehicle moves, allowing the driver to focus on steering and acceleration without needing to manually shift gears. This system uses a complex arrangement of gears, hydraulic systems, and electronic controls to optimize engine performance and fuel efficiency. Unlike a manual transmission, where the driver must engage the clutch and select gears, an automatic transmission simplifies driving by using a torque converter to manage power transfer. This makes it easier for drivers, especially in stop-and-go traffic, as they do not have to constantly shift gears.