A lighter is a portable device used to ignite a flame, commonly for lighting cigarettes, candles, or fires. It operates using fuel, typically butane or lighter fluid, which is ignited by a spark generated from a flint wheel or electric mechanism. The flame is controlled by adjusting airflow and fuel release. Lighters come in various designs, from disposable plastic models to refillable metal versions, like Zippo lighters. Many lighters also feature safety mechanisms to prevent accidental ignition. Compact and easy to carry, lighters are practical tools used in everyday life, camping, and emergencies.