moz·za·rel·la
/ˌmɒtsəˈrɛlə/
Mild, semisoft white Italian cheese, often used in Italian cooking as a melted topping, especially on pizzas. [ref]
Pizza is a dish of Italian origin consisting of a usually round, flat base of leavened wheat-based dough topped with cheese, and often various other ingredients, which is then baked at a high temperature, traditionally in a wood-fired oven. [ref]