The main ingredient in a traditional pasta sauce varies depending on the recipe, but a common base component is tomatoes. Whether using fresh, canned, or crushed tomatoes, they provide a rich flavor and natural sweetness to the sauce. Along with tomatoes, classic Italian pasta sauces may include ingredients like garlic, onion, olive oil, and a variety of herbs such as basil and oregano. These flavors meld together, creating a versatile sauce that complements different types of pasta. Many variations exist, with regional influences introducing ingredients like meats, vegetables, or cheese.