If you compare the profile of a man and the neck of a woman, you can clearly see that there is a 'bulk'; The apple of Adam.

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Due to the increase in testosterone levels in children during adolescence, the cartilages in the voice box will grow. The mass of the muscles will increase. Your vocal folds (which are muscles) will also become thicker. That is why there is a change of voice and why your voice will deepen as you go through puberty.

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The Adam's apple will become visible due to this increase in the size of the cartilage of the voice box. This typical characteristic of men (adults) is called "Adam's apple", which gets its name from the first man to walk on earth (according to the Bible): Adam.