PREPARE TO BE GROSSED OUT

[Cynical Ninja]

What kind of cheese do they put on the burgers at fast food chains over there?

Over here there is American pasteurized process cheese which actually is a real cheese made from milk and what is typically used on burgers. Then there is American processed cheese product which is imitation cheese and I'm not sure why anyone would eat it, it doesn't even melt.

Anything described as “american cheese” is not cheese that's why its called “american cheese” and not just “cheese”. Legally you cannot describe american cheese as cheese because it isn't cheese.