Fuel energy refers to the energy produced from various types of fuels, which can be derived from natural resources like coal, oil, natural gas, and biomass. These fuels are burned to release energy, which can then be converted into electricity or used to power vehicles and machinery. The combustion process generates heat, which is harnessed to perform work or generate power. Renewable sources of fuel energy, such as solar energy, wind energy, and biofuels, are becoming increasingly important as society seeks to reduce reliance on fossil fuels. These alternatives aim to provide cleaner energy options that minimize environmental impact while meeting the growing energy demands of the world.