When buying a car, you usually need to pay a part of the deposit. This deposit is to ensure that the car can be sold. Because some people have the desire to buy a car but don't pay, then 4s stores will use some means to let these people who can buy a car buy it.
The car purchase deposit can be refunded, but the deposit cannot be refunded. Cars generally have to pay a deposit, which is legally binding and legally guarantees the performance of the contract. Not buying a car means not fulfilling the contract, and the deposit is not refundable.