Here is some info from Wikipedia. The origins and nature of pizzas.

Pizza is a flatbread usually topped with tomato sauce and cheese and baked in an oven. It is typically topped with a choice of meats, veggies and condiments. The term was first tape-recorded in the 10th century, in a Latin manuscript from Gaeta in Central Italy.
The contemporary pizza was created in Naples, Italy, and the meal and its versions have actually since become popular in lots of areas of the world. In 2009, upon Italy’s request, Neapolitan pizza was safeguarded in the European Union as a Conventional Speciality Guaranteed meal.
The Associazione Verace Pizza Napoletana (the Real Neapolitan Pizza Association) is a non-profit company founded in 1984 with headquarters in Naples. It promotes and secures the “real Neapolitan pizza”. Pizza is offered fresh, frozen or in portions. Numerous types of ovens are made use of to cook them and lots of ranges exist.
A number of comparable dishes are prepared from ingredients frequently used in pizza prep work, such as calzone and stromboli. It is a popular fast food item.

So thanks to Wikipedia.