We learnt about cows and what things you have on a farm like a race, a tractor and a cow shed.
Rosie told us she has four stomachs to help her digest the grass she eats.
Cows go to the cow shed to get milked twice a day. The farmer puts special cups on the cows udders.
The milk goes to a place to be checked and bottled before it comes to our supermarket shelves.
Watch Rosie's video about milk here.
Have you played Rosie's World before?