Depending on where you live in the United States, wildfires can be frequent natural disasters or rare events. What are wildfires? Knowing wildfire basics can help you identify and address potential risks around your home and property. All fires need three components: fuel, heat and oxygen. These three compose what is called the fire triangle. In forests, live and dead vegetation, including dry leaves, twigs, logs and grasses, are fuel. Heat sources such as sparks, campfires, trash burn barrels, or lightning strikes start fires. Oxygen is readily available and wind increases the flow of oxygen, dries fuels, and helps increase fire spread and intensity. Remove one side of the triangle and fire cannot occur.