Combustion is a chemical reaction that occurs when a fuel, like wood or gasoline, reacts with oxygen from the air. This process produces heat and light, which is why we see flames when something burns. Combustion is essential for many everyday activities, such as cooking food or powering vehicles. There are two main types of combustion: complete and incomplete. In complete combustion, the fuel burns fully, producing carbon dioxide and water as byproducts. Incomplete combustion happens when there isn't enough oxygen, leading to the production of carbon monoxide and soot, which can be harmful to health and the environment.