Adam's Apple and Voice box
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Adam's apple (aka.  laryngeal prominence) exist in both men and women. It is a piece of bony cartilage called thyroid cartilage that wraps around the larynx (aka. voice box).

The Adam's apple is more prominent in males because males have have a bigger larynx (giving males a deeper voice). In males, the prominent Adam's apple typically appears during adolescence, when the larynx increases in size and the voice becomes deeper.