How does downshifting work in an automatic transmission?

Downshifting in an automatic transmission involves shifting to a lower gear, which serves several important functions. By downshifting, the vehicle can access greater power and torque, which is especially beneficial during acceleration, overtaking, or climbing hills. When the transmission moves to a lower gear, engine RPMs increase, allowing the engine to operate within a more effective power band. This results in a more responsive driving experience as the engine produces more power at higher RPMs, making it easier to maintain speed or gain momentum when needed.

In contrast, shifting to a higher gear would generally be done for improved fuel efficiency, which does not align with the functionality of downshifting. Maintaining the current gear regardless of speed does not utilize the potential advantages of downshifting, especially in scenarios requiring additional power. Similarly, disengaging the transmission completely goes against the principle of maintaining control of the vehicle's power and speed.