A spark plug is a crucial component in internal combustion engines, such as those found in cars and motorcycles. Its primary function is to ignite the air-fuel mixture within the engine's cylinders by producing a small electric spark. This ignition process is essential for the engine to generate power and operate efficiently. Spark plugs are typically made of metal and ceramic materials, designed to withstand high temperatures and pressures. They come in various types, including iridium and platinum spark plugs, which offer different performance benefits. Regular maintenance and replacement of spark plugs can improve engine performance and fuel efficiency.