Ignition methods refer to the various techniques used to initiate combustion in fuels. Common methods include using a spark, heat, or a flame to ignite materials. These methods are essential in various applications, such as in engines, stoves, and fireworks, where controlled combustion is necessary for operation. Different ignition methods can be categorized into two main types: direct and indirect. Direct ignition involves applying a flame or spark directly to the fuel, while indirect ignition uses heat sources, like a glow plug in a diesel engine. Understanding these methods is crucial for safety and efficiency in energy use.