What does the S and D in automatic transmission mean?

[McSerenity]

In automatic transmissions, D stands for Drive, which is the forward gear. S represents Sport mode (also known as Sport gear). Both gears can be engaged directly while driving. The D gear in an automatic transmission is equivalent to gears 1-5 in a manual transmission. When the D gear is engaged, the car moves forward, but unlike manual transmissions, the vehicle automatically shifts gears within the engine's RPM range without driver intervention. The shift points depend on engine load, the driver's driving style, and vehicle speed. When the S gear is engaged, the car's power increases, but fuel consumption also rises. The car can still shift freely in S mode, but it will upshift later or downshift earlier to keep the engine at higher RPMs, increasing torque output for greater power. Other gears in automatic transmissions: P stands for Parking, the parking gear. R stands for Reverse, the reverse gear. M stands for Manual, the manual mode. N stands for Neutral, the neutral gear. L stands for Low, the low gear, also known as the climbing gear.