As long as 4*4 is marked on an ordinary car, it means that the car is four-wheel drive, which means that the engine drives four wheels to do work at the same time, which can obviously improve the passability and enhance the off-road ability.
as long as it is not marked with 4*4, it defaults to 4*2, that is, two-wheel drive. One is engine front-wheel drive, the other is engine front-wheel drive, and the other is engine rear-wheel drive commonly used in professional racing cars.
Extended information
There are many kinds of four-wheel drive, including full-time four-wheel drive, timely four-wheel drive and part-time 4wd. Because of the comprehensive consideration of cost and economy, many urban four-wheel drive vehicles simply do not have differential locks; Even the so-called four-wheel drive only means that four wheels can be driven together, but the power that the rear wheel or the front wheel can distribute is very small.
for example, many urban four-wheel drive SUVs have a 9: 1 power distribution, or even a 95: 5 power distribution, which can basically be regarded as a front-wheel drive. This kind of design itself is not for off-road, but to improve some driving stability, and it is basically impossible to get rid of a single wheel, let alone any off-road ability.
the advantages of four-wheel drive are stability and safety. If it is a front-wheel drive or a rear-wheel drive, if you accelerate sharply, the center of gravity of the car body will naturally move backward and there will be a certain degree of backward tilt. Because the four wheels of the four-wheel drive work together, the chassis moves in the same direction. This inclination will be smaller than that of the two-wheel drive, and you will feel more stable. The advantage of four wheels working together is that the probability of slipping is greatly reduced when they are fully accelerated, because the friction of four wheels is always higher than that of two wheels.