Black piece under front bumper

Hi Guys,

Im just wondering if anyone know what is that black piece under my front bumper? I've attached a photo.

I realised sometimes i scrape that piece when going up driveways.

Many Thanks

6R Polos have the same little air dam and my wife was always scraping it on those parking strips. No idea what its there fore apart from being annoying

My guess is that is part of the aerodynamics to reduce the amount of air going underneath the car.
Mine is also damaged, mainly on those car park bump stops.

I have the same piece under my WV so i guess is as the others say, just for aerodynamics. I have thought about getting it off in the past, but after seeing it on other cars, i just left it.