The term "ignitable" refers to a substance's ability to catch fire and burn when exposed to a heat source or flame. Materials that are ignitable can easily ignite and sustain combustion, making them potentially hazardous in certain environments. Common examples of ignitable substances include gasoline, paper, and wood. In safety regulations, ignitable materials are often categorized to help prevent fires. Understanding which materials are ignitable is crucial for industries like construction and manufacturing, where proper storage and handling can reduce the risk of fire-related accidents.