Iridium v/s ordinary spark plug

In dedicated race cars resistor-less copper plugs are used. Iridium and platinum plugs are chosen for their longevity only. ... The main difference is the material that the 'tip' of the spark plug is made of - normal ones are usually copper, whereas the other two have tips made out of platinum or iridium.
famous spark plugs ;
NGK spark plugs
Bosh spark plugs
Terminal
Insulator
Ribs
Insulator tip
Seals
Metal case/shell
Central electrode
Side (ground, earth) electrode
Spark plug gap

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