Fuel combustion is a process where fuel is consumed in a chemical reaction. This reaction then releases energy in the form of light and heat. In most cases, the fuel used is a hydrocarbon that reacts with oxygen in the air. Fuel combustion is mainly used to provide energy, and the most common types of fuels used are fossil fuels such as coal, oil, and natural gas. Fossil fuels consist of ancient organic material that has decomposed. The energy that is produced when fuels com-bust can be used to power many different things ranging from vehicles to household and industrial appliances.