Combustible materials are substances that can be burned to produce energy. Tinder, FUEL, PEAT, wildfire, FIREWOOD, and KINDLING are all examples of combustible materials. Tinder is a dry material that can easily be ignited with a spark or flame, while FUEL is a substance that is used to produce energy when burned. PEAT is a type of FUEL made from partially decomposed plant matter, while wildfire is an uncontrolled fire that spreads quickly through a natural area. FIREWOOD is wood that has been cut and dried for use as FUEL, and KINDLING is small pieces of wood used to start a fire.