There are many kinds of sandwiches. In the United States, other foods with bread as the skin are also regarded as a kind of sandwiches. Such as tortilla (Mexican staple food), bread roll and Italian authentic bread focaccia. Hamburgers are also a kind of sandwiches. However, most English-speaking countries do not think so.

Scandinavians traditionally use the only piece of bread, with meat, fish, cheese and so on. Nothing on the top, this is the traditional Nordic food-open sandwich.

Rubin sandwich is a common sandwich in America.

Quiznos's Submarine sandwich is usually made of French bread cut from it and ingredients, usually about 12 inches long and 3 inches wide. Generally, the ingredients are meat, cheese, lettuce, tomato, seasoning, general sauce or salad dressing.

It is generally believed that the word "submarine sandwich" comes from a restaurant in Skore Square in Boston, Massachusetts, USA since World War II.