App-Connect: Discover Media for Composition Media

Hi guys, I have the possibility to drive a T-Roc soon. This includes the Discover Media with the Radio Composition Media. In addition, the equipment list says that this “App-Connect” is also on board. I watched the explanation video on the homepage. But I honestly don’t get that smart from it. If this app-Connect is with me then I have depending on the phone “Apple CarPlay” or “Android Auto”? And then what is this “MirrorLink”? In a Product video for the combination of Discover Media and Composition Media I have seen that you have the possibility to enjoy “W-LAN” under the media selection (play media from e.g. USB, SD or CD, …). Does this mean that you can connect the respective mobile phone with the car via W-LAN? If yes, this would be really a wonderful thing! I hope someone can help me here! Thank you. Greetings!