What do A-class and S-class mean in cars?

[SanNova]

Here is the relevant introduction about car A-class and S-class: A-class: These are entry-level models, generally small family cars with the most affordable prices. Due to their smaller size, comfort is naturally average, and the performance and configuration cannot be considered excellent, but they are sufficient for family use. Most are equipped with 1.5L or 1.3T engines, focusing mainly on fuel efficiency for family use. S-class: This is the flagship model of the Mercedes-Benz family. According to market demand, the S-class is subdivided into four models: S320L, S350L, S450L, and S500L. The letter 'L' stands for 'long-wheelbase,' meaning the body size has been extended. The higher the numerical value, the relatively more expensive the model is, and it is not a typical family car.