I'm American, and processed cheese or cheese "products" are common here. They have very little dairy in them, and come in jars, boxes, and spray cans. Slices usually come individually wrapped in cellophane. People use cheese products to cook with or put on crackers, but they taste awful and are unhealthy.
So if you are ever in an American grocery store and see things like Velveeta, Cheez-Whiz, Easy Cheese, Kraft Singles, or American cheese -- my advice is to keep walking! A lot of people use them, but I think they're terrible.