A submarine sandwich, often called a sub or hoagie, is a type of sandwich made with a long roll of bread. It is typically filled with various ingredients, including meats, cheeses, vegetables, and condiments. The bread is usually soft and can be toasted or served fresh, making it a popular choice for lunch or a quick meal. Submarine sandwiches can be customized to suit individual tastes, with common fillings like turkey, ham, salami, and lettuce. They are often served in delis and sandwich shops, and their size makes them ideal for sharing or enjoying on the go.