Once upon a time...
You saved up and bought a car you could afford, outright. It might not be fancy, but it would get you from A to B.
Then came finance. You found a car that you could afford the monthly payments on. When you made the final payment, the car became yours.
Then came PCP... You find a very fancy car that you like the look of and pay a whopping great deposit for it. Then you pay a monthly instalment for it for a set period. You must keep to a set mileage or you will be charged excess payments. Ditto for wear and tear. At the end of the period you hand back the car and own...nothing.
Or, you pay another whacking great payment and the car is yours.