Progestins are synthetic hormones that mimic the effects of the natural hormone progesterone, which plays a crucial role in the menstrual cycle and pregnancy. They are commonly used in various forms of hormonal contraception, such as birth control pills and intrauterine devices (IUDs), to prevent ovulation and regulate menstrual cycles. In addition to contraception, progestins are also used in hormone replacement therapy for menopausal women and to treat certain medical conditions like endometriosis and abnormal uterine bleeding. Their ability to influence the uterine lining makes them important in reproductive health management.