Spark plugs are small devices found in the engines of most gasoline-powered vehicles. They create a spark that ignites the air-fuel mixture in the engine's combustion chamber, allowing the engine to produce power. Each spark plug is designed to withstand high temperatures and pressures while ensuring efficient combustion. Typically made of metal and ceramic, spark plugs have a central electrode and a ground electrode. Over time, they can wear out or become fouled, leading to engine performance issues. Regular maintenance, including checking and replacing spark plugs, is essential for optimal engine function and fuel efficiency.