What's a cheese steak? Just a steak but with melted cheese on top? Doesn't that ruin the steak?

The steak is sliced very thin and cooked (often with cheese incorporated), so think of it as more of a beef sandwich than a steak on bread.

it would if it was actually a steak. for the type of meat you get on cheeesteaks - trust me - you want the cheese :)

Technically they're not allowed to call it cheese. ;)

lol