I love eating pizza, a traditional Italian dish consisting of dough and tomato sauce.  Do you enjoy pizza?
yes I eat it all the time
So it turns out the pizza we eat today is called "modern" pizza, which was first invented in Naples and now has become a staple dish throughout the world.
as opposed to what other pizza
You could say it's the "traditional" pizza, which was primarily made out of flat bread, also known as "panis focacius",.  The shape of it would be in a shape of a bread and not your round pizzas you see today.
so when did modern pizza start
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
called pizzettas.
The term "pizza" was first recorded in the 10th century in a Latin manuscript from the Southern Italian town of Gaeta in Lazio, on the border with Campania. Modern pizza was invented in Naples, and the dish and its variants have since become popular in many countries. It has become one of the most popular foods in the world and a common fast food item in Europe and North America, available at pizzerias (restaurants specializing in pizza), restaurants offering Mediterranean cuisine, and via pizza delivery