We might debate which country invented the pizza, but there is no denying that it is one of the most popular foods throughout the world. A pizza at its core, consists of three things: sauce, dough and toppings. It is hard to believe that such a simple dish can spawn hundreds of variations which results into a 30 billion dollars worldwide industry not to mention the large number of pizza-makers and chefs who have specialized in perfecting the dish. While there might be more than 20 types of pizza, let's take a look at only the 9 most popular types of pizza.

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