Any material the is burnt to generate energy is called a fuel  give energy for vehicles to move. The process by which fuel is couverted into energy is called combustion. Typer of fuel fuels can be divided into two groups. 1. Fossil fuels.   2. Alternate fuels.                  Fossil fuels are obtained from the remained of dead plants and animals that were deep in the earth millions of years ago . Fossil fuels exhaust easily and take a long time to form again coal petroleum and natural gas are fossil fuels.