The Adam’s apple is a chunk of bony cartilage wrapped around the larynx (voice box). Both males and females have an Adam’s apple.
Usually, when boys go through puberty, male hormones cause the larynx to grow rapidly, deepening their voices and causing the bulge to form. Female voices also deepen with puberty, but since their larynx is not affected by so much testosterone, they don’t bulge as much.
In adult men, the Adam’s apple sticks out more because of their larger voice boxes. They range in prominence from huge and obvious to practically invisible and doesn’t have anything to do with the depth of the voice. Some females have larger Adam’s apples than others, just like some have larger feet, hands or facial hair.
If you don’t already have a visible Adam’s apple, it probably won’t grow bigger on testosterone.