Explain the concept of birth control.?

Preventing pregnancy. Birth control is simply using various means to prevent pregnancy. This includes things like abstinence from sex, using barriers like condoms to prevent the sperm entering the female and medications that prevent ovulation.
Hormonal methods. Typically, the levels of sex hormones in a female rise and fall in a cyclic pattern. This is what causes a woman's cycle and controls ovulation. Common birth control methods such as the pill or patch that use hormonal regulation give a constant amount of hormones. This keeps the levels high and prevents the natural cyclic pattern therefore preventing ovulation.
Hormonal Methods. Typically, the levels of sex hormones in a female rise and fall in a cyclic pattern. This is what causes a woman's cycle and controls ovulation. Common birth control methods such as the pill or patch that use hormonal regulation give a constant amount of hormones. This keeps the levels high and prevents the natural cyclic pattern therefore preventing ovulation.