What is "grilled cheese sandwich"?

A grilled cheese sandwich is a classic American sandwich that is made with two slices of bread and melted cheese. To make a grilled cheese sandwich, two slices of bread are buttered on the outside and then filled with one or more types of cheese, such as cheddar, American, or Swiss. The sandwich is then cooked on a griddle or in a frying pan until the bread is crispy and golden brown and the cheese is melted and gooey. Grilled cheese sandwiches are often served with a side of tomato soup, which is used for dipping the sandwich. Grilled cheese sandwiches can be customized with additional ingredients, such as ham, bacon, or tomato, to create a variety of flavor combinations.