Automatic transmission and automatic transmission are the same thing.
An automatic transmission (AT) is a type of transmission that automatically changes gears depending on the speed and load on the engine. It allows the driver to control the car without manually changing gears.
The term “automatic” is often used as shorthand for automatic transmission, as it is the most common type of automatic transmission.
In general, automatic transmission and automatic transmission are synonymous and refer to the same type of transmission.