Incineration ash is the residue left after waste materials are burned in an incinerator. This ash consists of inorganic materials, such as metals and minerals, that do not combust during the incineration process. It can vary in composition depending on the type of waste being burned, including household waste, industrial waste, or medical waste. The ash is typically classified into two types: bottom ash, which collects at the bottom of the incinerator, and fly ash, which is carried away with the flue gases. Proper management of incineration ash is essential, as it may contain harmful substances that require careful handling and disposal to protect the environment and public health.