Birth control pills are medications taken by women to prevent pregnancy. They contain hormones, usually a combination of estrogen and progestin, which work by stopping ovulation, thickening cervical mucus, and thinning the uterine lining. When taken correctly, they are over 99% effective in preventing pregnancy. In addition to preventing pregnancy, birth control pills can also help regulate menstrual cycles, reduce menstrual cramps, and treat conditions like polycystic ovary syndrome (PCOS) and acne. It is important for individuals to consult with a healthcare provider to determine the best option for their needs.