Marinara originated from southern Italy and it’s a sauce that can be served with spaghetti, seafood, as a dip, or used as a pizza sauce.The sauce is typically made with garlic, onions, and herbs. It is then simmered for a bit. It’s considered a basic tomato sauce, it never has meat in it, and is made relatively thin.  On the other hand, spaghetti sauce is often thicker, takes longer to cook and simmer, and is primarily used for spaghetti. It often includes meat.