Pizza itself is an Italian dish that consists of a base, usually round, flattened and made from wheat-based dough, that can be topped with a range of toppings. Most pizzas use cheese and tomato as the basic toppings, called the cheese pizza or margherita, but others can be added.
The pepperoni pizza is more of a U.S. creation than an Italian one, and in the U.S., it is often called a sausage pizza. Outside the U.S., this is less typical, for "sausage" is not a term used to describe pepperoni. Pepperoni is an American salami that is made from cured pork and beef and seasoned with paprika or other chilli pepper. For a pepperoni pizza, the salami is sliced thinly.
Image: Pink Sherbet Photography from USA / CC BY (https://creativecommons.org/licenses/by/2.0)
