A pizza cutter (also known as a roller blade) is a handheld kitchen utensil that is used to cut various items into sections or slices.The original design has been modified over the years to include different sizes, blades, handles, and uses.It was intended to assist in cutting herbs and vegetables and could be found in either a single or double blade.The most common uses a wheel that rotates in a circle while a person moves the cutter in a direction that they would like to cut the pizza.The other type is a large curved knife called a mezzaluna, which is rocked back and forth to cut the pizza.