An Italian sub, also known as an Italian hoagie or submarine sandwich, is a popular sandwich originating from Italian-American cuisine. It typically consists of a long roll filled with various cured meats, such as salami, capicola, and mortadella, along with cheese, usually provolone. Fresh vegetables like lettuce, tomatoes, and onions are often added, along with condiments like oil, vinegar, and spices. The sandwich is served cold or sometimes toasted, making it a versatile option for lunch or a quick meal. It is commonly found in delis and sandwich shops across the United States, reflecting the influence of Italian immigrants on American food culture.