Lighter fluid is a flammable liquid used to ignite fires, commonly found in products like disposable lighters and charcoal briquettes. It typically contains hydrocarbons, which help produce a quick and intense flame. When using lighter fluid, it's important to follow safety guidelines, as it can be hazardous if mishandled. Proper ventilation and keeping it away from open flames are essential to prevent accidents. Always store lighter fluid in a cool, dry place, away from children and pets.