Combustion is a chemical reaction that occurs when a substance, usually a fuel like gasoline or wood, reacts with oxygen to produce heat and light. This process typically results in the formation of carbon dioxide and water as byproducts. Combustion can be classified into two main types: complete and incomplete. Complete combustion occurs when there is enough oxygen, while incomplete combustion happens when there is insufficient oxygen, leading to the production of carbon monoxide and soot. This reaction is essential in many everyday applications, such as in engines for vehicles and in heating systems for homes. Combustion is also a key process in various industries, including power generation and manufacturing. Understanding combustion helps improve energy efficiency and reduce harmful emissions, contributing to a cleaner environment.