A spark plug is a small device in a car engine that creates a spark to ignite the fuel. It receives electric power from the engine’s ignition system and uses it to create a spark between two electrodes. The timing of the spark is important for the engine to work properly, and it typically happens just before the fuel ignites.

Keeping spare spark plugs with you can help you replace them quickly and easily. This can prevent unexpected car breakdowns and ensure your engine runs smoothly. In an emergency or regular car maintenance, having spare spark plugs can save you from an inconvenient situation on the roadside.