Different places offer entirely distinct road conditions. Some roads may be smooth and easy-going, while a lot of them can be rocky and muddy. It would help if you were prepared for all the possible road scenarios. The tyres experience maximum pressure on the road.
A standard format in which this codes or markings are written is '225/55 R 17 97 W'. Consider this just as an example. For your ease, let's formulate it as 'X/Y R D L S'. Read along to know what each of these values signifies and how they are essential for your selection.