Fuel, heat, and oxygen. That is known as the "Fire Triangle." ... Like a lot of heat and a lot of light. The sun releases so much energy and light that looks like a ball of fire!

Those three factors form what he calls a “fire triangle”—neglect one side and the whole thing collapses. Generally, fuel means wood, and an ignition source is a match or lighter.

Heat, in the context of the fire triangle, plays a crucial role in initiating a fuel’s off-gassing process. Once a fuel undergoes off-gassing, it gains the potential to produce a flame.