The front bumper, hood, flares, behind the rear tire, trunk lid and wing are PPF. The PPF guards the paint from rocks and other stains that may arise. The ceramic on top gives it another layer and makes extremely hard for anything to stick to it. For example if the car is clean but gets covered in pollen. A good rain will wash it all off and leave it as is you had just washed it.
I personally did the PPF for protection from rock chips. Otherwise I wouldn’t have gotten it.
Look up a BAD ceramic job and you can then see it is like a hard clear coat. When it’s done right you can’t see it is there.
Also you need a specific ceramic for PPF.