The cheesesteak, known outsie the Philadelphia, Pennsylvania area as the Philadelphia cheesesteak, Philly Steak and Cheese, Philly cheesesteak, steak and cheese, or simply a Philly is a sandwich principally made up of thinly sliced pieces of steak and melted cheese on a long roll. A cheesesteak without cheese is locally called a steak sandwich, or a Philly Steak in other parts of the country.