A submarine sandwich, often called a sub or hoagie, is a type of sandwich made with a long roll of bread, typically filled with various ingredients. Common fillings include meats like ham, turkey, or salami, along with cheeses, vegetables, and condiments. The bread is usually soft and can be toasted or served cold. Submarine sandwiches are popular in many regions, especially in the United States. They are often served in delis and sandwich shops, and can be customized to suit individual tastes. The sandwich is named for its shape, resembling a submarine vessel.