by Bob Kennedy

It's a very simple dish: Some bread dough pounded flat, covered with tomato sauce and some Mozzarella cheese scattered on top, baked. Other ingredients can be thrown on (Pepperoni, sausage, black olives, green peppers, onions and anchovies are big favorites), but none of them is essential.

In fact, even the tomato sauce and cheese are considered optional; traditional Roman pizza has no tomato sauce (which in some circles would qualify it as Welsh Rarebit), and traditional Sicilian has little or no cheese. There is no pizza equivalent of the Laws of Kosher; people can throw just about anything on flatbread and call it. 

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Source: http://www.collegenews.com/