Pizza is an oven-baked, flat, round bread typically topped with a tomato sauce, cheese and various toppings. The modern pizza was invented in Naples, Italy, and the dish has since become popular in many parts of the world. An establishment that makes and sells pizzas is called a "pizzeria". Many varieties of pizza exist worldwide, along with several dish variants based upon pizza. Below are some of the most common pizzas in Italy followed by the ingredients in each.