A thermal cooker is a kitchen appliance designed to cook food using retained heat. It consists of an insulated pot that keeps food hot for several hours after initial cooking. This method allows for energy-efficient cooking, as it requires less fuel and time compared to traditional cooking methods. Thermal cookers are often used for slow-cooking meals like stews and soups. They can also be beneficial for outdoor activities, such as camping, where access to a heat source may be limited. Popular brands include Zojirushi and Thermos, which offer various models to suit different cooking needs.