A charcoal iron box, also known as a charcoal iron or sad iron, is a traditional household appliance used for ironing clothes. It consists of a heavy iron box with a flat bottom, designed to hold burning charcoal or hot coals. Users heat the iron box by placing burning charcoal inside it, allowing it to reach the desired temperature for ironing. The hot iron is then pressed onto wrinkled clothing to smooth out the fabric. Charcoal iron boxes were widely used in the past before the advent of electric irons, providing a manual and effective method for achieving wrinkle-free attire.