Why is it important to regularly check and replace the spark plugs in an Audi 80?

I've heard that routine maintenance is crucial for keeping your Audi 80 running smoothly, but I'm not sure why checking and replacing the spark plugs is necessary. Can you explain the specific reasons behind this maintenance task?

Spark plugs are responsible for creating the spark that ignites the fuel in your Audi 80's engine. Over time, they can become worn out and decrease in effectiveness. It's important to check and replace them regularly to ensure optimal engine performance.