Combustion is a chemical reaction where substances react with oxygen, producing energy in the form of light and heat. It can be either complete or incomplete, depending on the amount of oxygen present. In complete combustion, there is an excess of oxygen, resulting in the production of carbon dioxide and water. In incomplete combustion, there is a limited amount of oxygen, leading to the production of carbon monoxide, carbon dioxide, and water. Incineration, on the other hand, is the process of destroying something through burning. It is mainly used as a waste management process and involves the combustion of organic material in waste. The final products of incineration are ash, flue gas, and heat.