Fires are not just a hazard, they are also fascinating. Different types of fires require different types of precautions. Knowing the different types of fires and how they work will help you to be more prepared for any kind of fire that may occur. There are four major categories of fire: chemical, electrical, natural, and incendiary. Chemical fires involve substances such as gasoline or oil that have been spilled or leaked onto a surface and then ignited by heat or flame. Electrical fires can happen when wires come into contact with water or another conductive material like metal. Natural fires can start from sources such as lightning strikes, campfires, cigarettes left unattended, and faulty wiring in appliances like space heaters and air conditioners. Incendiary fires are the result of deliberate acts such as arsonists setting things on fire with matches or lighters to cause damage to property or harm people.