Fire is a chemical reaction that occurs when a substance (typically a fuel) reacts with oxygen in the presence of heat, resulting in the release of energy in the form of light, heat, and gases. This process is called combustion. The basic components required for fire are often referred to as the "fire triangle," which includes: Heat – A sufficient temperature to start and sustain combustion. Fuel – A material that can burn, such as wood, paper, or gas. Oxygen – A component of the air that supports combustion. When these three elements are present in the right conditions, a fire can be ignited. If any one of these elements is removed, the fire will be extinguished.