What are the sources of fuel for a wildfire?

Wildfires primarily rely on three sources of fuel: vegetation, such as grasses, shrubs, and trees; dead organic matter, including fallen leaves, branches, and decomposing plants; and weather conditions that can enhance flammability, such as low humidity and high winds. The moisture content of these fuels significantly affects their combustibility, with drier materials igniting more easily. Additionally, human activities can contribute to fuel sources, including discarded cigarettes, campfires, and arson.