Birth control pills are medications taken by women to prevent pregnancy. They contain hormones, usually a combination of estrogen and progestin, which work to inhibit ovulation, making it less likely for an egg to be fertilized. When taken correctly, these pills can be 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 acne and polycystic ovary syndrome (PCOS). It is important for women to consult with a healthcare provider to determine the best type of pill for their individual needs.