👉 Follicle is a type of organ in the body that produces and secretes sex hormones, such as estrogen. It's an important part of the female reproductive system, responsible for regulating fertility and producing eggs. The follicles are like tiny growth plates on the outside wall of a woman's ovaries. In layman's terms: Follicle is a small, round organ in the body that produces sex hormones and helps regulate your menstrual cycle.