Irons are so-called because their club heads are made of metal. Of course, "woods" are now also made of metal, but that's a relatively recent development. Irons have featured metal club heads (steel, these days) for centuries.
Irons feature thin club heads and grooved faces. Accomplished players might choose a "muscle back" or "blade" style of iron, whereas beginners and most recreational players will want a "cavity back" style.
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