The term tandoor /tɑːnˈdʊər/ refers to a variety of ovens, the most commonly known is a cylindrical clay or metal oven used in cooking and baking. The heat for a tandoor was traditionally generated by a charcoal or wood fire, burning within the tandoor itself, thus exposing the food to live-fire, radiant heat cooking, and hot-air, convection cooking, and smoking by the fat and food juices that drip on to the charcoal. Temperatures in a tandoor can approach 480 °C (900 °F), and it is common for tandoor ovens to remain lit for long periods to maintain the high cooking temperature. The tandoor design is something of a transitional form between a makeshift earth oven and the horizontal-plan masonry oven.