Iridium Spark Plug Vs 'Normal' Spark Plug – What's The Difference?

There are three types of spark plug – iridium, platinum/rhodium, and copper – and all work in the same way, so what makes them different?
Spark plugs play an essential role in gas ignition engines by generating an electric spark across a small ignition gap, that fires a combustion chamber and powers the engine. There are three types of spark plug – iridium, platinum/rhodium, and copper – and all work in the same way, so talking about the difference between iridium and ‘normal’ spark plugs is somewhat misleading. The only real difference is the metal used to create the central electrode.

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