Schlagobers is the Austrian word for whipped cream where it is also known in German as Schlagsahne.
Schlagobers is always served with cakes in Austria and in Germany.
I've experienced that in both countries when you are served with cakes there is always fresh Schlagobers/Schlagsahne on the side. In bakeshops and cafes, when you order a cake, you will always be asked if you want it topped with whipped cream.
This is one of the things Ive learned living in Germany, to make whipped/whisked cream from a cream