The main ingredient in marinara sauce is tomatoes. Typically, fresh or canned tomatoes are used as the base, contributing to the rich flavor and vibrant color of the sauce. Marinara sauce is often complemented by garlic, onions, olive oil, and various herbs such as basil and oregano, enhancing its taste. This sauce is a staple in Italian cuisine and serves as a versatile component for many dishes, including pasta, pizza, and seafood. Its simplicity and robust flavor make marinara a popular choice for home cooks and chefs alike.