An online pizza ordering system can be a website or an app that allows customers to order food for delivery or takeout.

Some of the main features of an online pizza ordering system are:

-Ability to choose from a wide variety of pizzas, toppings, and crusts

-The ability to choose from different crust types such as thin, deep dish, regular crust and gluten free crust

-Ability to choose from different toppings such as pepperoni, bacon bits, pineapple etc.

-Ability to customize the size of pizza

-Ability to track your order and know when it will be delivered

-A user friendly interface