Flatbread is a type of bread that is usually unleavened and cooked on a hot surface. PITA, roti, and naan are all varieties of flatbread. PITA is a round, slightly leavened flatbread that is popular in Middle Eastern cuisine. Roti is an unleavened flatbread that is popular in South Asian cuisine. Naan is a leavened flatbread that is popular in Indian cuisine. All three varieties of flatbread are popular around the world.