Butane lighters are portable devices used to create a flame for lighting purposes. They operate by releasing butane gas, which is ignited by a spark from a flint or electronic ignition system. These lighters are commonly used for lighting cigarettes, candles, and campfires. The design of butane lighters varies, with some featuring adjustable flame sizes and safety locks. They are refillable, allowing users to replace the butane gas when it runs out. Popular brands include BIC and Zippo, known for their reliability and ease of use.