Solar cooker or Solar oven is a device which uses the energy of direct sunlight to heat, cook or pasteurize food or drink. The vast majority of solar cookers presently in use are relatively cheap, low-tech devices. 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 (for low-income people) and air pollution, and to slow down the deforestation and desertification caused by gathering firewood for cooking.
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. "Solar cooking is the simplest, safest, most convenient way to cook food without consuming fuels or heating up the kitchen."The first solar cooker we know of was invented by Horace de Saussure, a Swiss naturalist experimenting as early as 1767.