A grilled cheese sandwich is a simple and popular dish made by placing cheese between two slices of bread and grilling or toasting it until the bread is golden brown and the cheese melts. Common types of cheese used include cheddar, American, and Swiss, but any cheese can be used based on personal preference. The sandwich is often prepared using butter or margarine on the outside of the bread to achieve a crispy texture. It can be served alone or with sides like tomato soup for dipping. Grilled cheese sandwiches are enjoyed by people of all ages and are a staple in many households.