A box cooker is a simple solar cooking device that uses sunlight to heat food. It typically consists of an insulated box with a transparent lid that allows sunlight to enter while trapping heat inside. The design helps to cook food slowly and evenly, making it an energy-efficient option for outdoor cooking. These cookers are often made from materials like cardboard or wood and can be lined with reflective surfaces to enhance heat absorption. Box cookers are popular in areas with abundant sunlight and are used for various cooking tasks, including baking and boiling, without the need for traditional fuels.