Birth control, also known as contraception or contracception, is a method of preventing pregnancy by using various methods such as barrier methods, hormonal methods, intrauterine devices, and sterilization. Birth control has been used for centuries, but the modern methods of contraception have only been available since the 20th century. Birth control is an important part of family planning and is used to prevent unwanted pregnancies, reduce the risk of sexually transmitted infections, and improve overall health.