The Honda City/Grace gearbox comes with 6 functions as seen in the image below:
P - Park
R - Reverse
N - Neutral
D - Drive
L - Low Gear
This function keeps the car in low gear. This is good for going up steep slopes where the car will require more pulling power.
S - Sports Mode
This function limits the gear shift to 2nd gear. Use it for overtaking but it can damage the gearbox if used excessively. Please use only when necessary.