Tomato sauce is a sauce made primarily from tomatoes. It is a versatile condiment that can be used in a variety of dishes, including pasta, pizza, soups, stews, and more. Tomato sauce can be made in many ways, but typically involves cooking fresh or canned tomatoes with onion, garlic, herbs (such as basil and oregano), and other seasonings until they break down into a thick, rich sauce. Some recipes may also call for additional ingredients, such as sugar, vinegar, or red pepper flakes, to adjust the flavor or spice level of the sauce. Overall, tomato sauce is a delicious and easy-to-make addition to many different types of dishes.