Pizza sauces are usually, but not exclusively tomato-based and tend to be simpler than spaghetti sauces as the flavour of the pizza is usually more dependent on the pizza toppings than the sauce itself. Some pizzas are made with non-tomato pizza sauces, such as pesto, olive oil or white sauce, while some pizzas have no sauce at all.
Commercial pizza sauces tend to be slightly chunky tomato sauces with a variety of herbs and spices already added.