my favorite food is pizza
Mmm. I love pizza. I am from the NY metro area and am a pizza snob. lol The word pizza was first documented in AD 997. Didn't realize it was that old. 
was it originally from Italy?
No, it wasn't. The precursor of pizza was more then likely the focaccia. It was a flat break known to the Romans as "panis focacius.". Toppings were then added to it. 
so what makes a pizza a pizza :)
It was in the late 18th century when tomato was added to the focaccia in Naples.
I like a simple thin crust cheese pizza
Pizza cheese
Pizza cheese encompasses several varieties and types of cheeses and dairy products that are designed and manufactured for use specifically on pizza. These include processed and modified cheese such as mozzarella-like processed cheeses and mozzarella variants. The term can also refer to any type of cheese suitable for use on pizza. The most popular cheeses used in the preparation of pizza are mozzarella (accounting for about 30%), provolone, cheddar and Parmesan. Emmental, Romano and ricotta are often used as toppings, and processed pizza cheeses
History of pizza
The history of pizza begins in antiquity, when various ancient cultures produced basic flatbreads with several toppings.
A precursor of pizza was probably the focaccia, a flat bread known to the Romans as , to which toppings were then added. Modern pizza developed in Naples when tomato was added to the focaccia in the late 18th century.
The word "pizza" was first documented in 997 A.D. in Gaeta and successively in different parts of Central and Southern Italy. Pizza was mainly eaten in Italy and