A double boiler is a kitchen tool used for gentle cooking or melting ingredients. It consists of two stacked pots: the bottom pot holds simmering water, while the top pot contains the food or ingredients. This setup allows for indirect heat, preventing burning or scorching, making it ideal for delicate tasks like melting chocolate or preparing sauces. Double boilers are commonly used in baking and candy-making, where precise temperature control is essential. They can also be helpful for cooking custards or reheating foods that require a gentle touch. Many cooks appreciate the versatility and safety of using a double boiler in their culinary practices.