Butane lighters are small, portable devices used to create a flame for lighting purposes. They typically contain a reservoir filled with butane, a flammable gas that is stored under pressure. When the lighter is activated, the gas is released and ignited by a spark, producing a steady flame. These lighters are commonly used for lighting cigarettes, candles, and campfires. They are favored for their convenience and ease of use, as they can be easily refilled with butane when empty. Many designs also include safety features to prevent accidental ignition.