A solar cooker is a device which uses the energy of direct sunlight to heat or cook food or drink. Many solar cookers presently in use are relatively inexpensive, low-tech devices , although some are as powerful or as expensive as traditional stoves, and advanced, large-scale solar cookers can cook for hundreds of people. Because they use no fuel and cost nothing to operate, many nonprofit organizations are promoting their use worldwide in order to help reduce fuel costs and air pollution. Solar cooking is a form of outdoor cooking and is often used in situations where minimal fuel consumption is important, or the danger of accidental fires is high, and the health and environmental consequences of alternatives are severe. Many types of solar cookers exist, including parabolic solar cookers, solar ovens, and panel cookers.