Ok I'm New

Hey Guys! I'm kind of new at this whole Street Race scene. Ok I just got a 2001 VW GTI Turbo. I was looking at Body Kits for it. I found a price for a Front Apron. It had a decked out front end of a car Picture with it. Next I looked at a Front Splitter. I found pretty much the same pic. So I'm confussed. So my Question is
What is the diffrence between a Front Splitter and a Front Apron?

Thanks Guys