Buying a used car can be an excellent way to save money. In order to buy a new car outright you need a substantial income. There are also payment plans available but in the end you end up paying much more for the car than if you had just bought it completely at the outset.
While the same system applies to used cars, the overall amount you end up paying is significantly less. Used cars are obviously cheaper because they have been owned and driven previously.
For example, say you found a used Audi for sale, the advertised price would be decided according to what the overall condition of the car was, whether it has been in any bad accidents and how much mileage it had done. All of these factors combining to save you money if you know what to look for.
You wouldn't want to buy a new driver a brand new car; you want to get them a car that has been around the block a couple of times. And of course you want the car to be safe, and a used Audi would certainly fill those criteria.
Cars are not bought to be ornaments that sit behind class; they are made to be driven. So whatever car you decide to buy, new or used, just enjoy driving it.