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 is melted. Common types of cheese used include cheddar, American, and Swiss, but any cheese that melts well can be used. This sandwich is often enjoyed as a comfort food and can be served with sides like tomato soup or pickles. It is easy to prepare, making it a favorite among both children and adults. Variations may include adding ingredients like tomatoes or bacon.