The oven is a heating device that uses radiant heat generated by various sources. Radiant heat is a mechanism for heat transfer that does not require a medium in which it propagates. Radiant heat is generated by burning coal using gas burners, electrical coils, and radiation energy.Traditional ovens use gas or electricity to disperse heat within the oven cavity. Depending on rack placement and settings, ovens can apply direct heat to brown or crisp dishes, or apply more diffused heat for gently baking.