A gas burner is a device that uses gas as a fuel source to generate heat for cooking, heating, or other industrial processes. Gas burners typically have a series of small holes or nozzles that allow gas to mix with air and burn in a controlled manner. They can be designed for different types of gas, such as natural gas, propane, or butane. Gas burners can be adjusted to control the amount of heat output and flame size. They can be integrated into various appliances, such as ovens, stoves, furnaces, and water heaters.