Marinara sauce is a classic Italian tomato-based sauce made with tomatoes, garlic, onions, herbs, such as basil, oregano, and parsley, and olive oil. It has a rich and robust flavor with a hint of sweetness from the tomatoes and a savory depth from the garlic and herbs. Marinara sauce is typically simmered over low heat to allow the flavors to meld together, resulting in a thick and flavorful sauce that pairs well with pasta, pizza, meatballs, seafood, and other dishes.