Can you tell me what birth control pills are?

Hormones: The most commonly used birth control pills have two hormones in them, estrogen and progestin. Birth control pills help prevent pregnancy through four methods. They make the cervical mucus too think for sperm to move. They slow the fine hairs in the fallopian tube that push the egg forward. They thin the lining of the uterus so an egg can't live there. They stop your ovaries from making an egg.

Just that: They are pills that regulate the cycle in such a way as to inhibit ovulation, thereby affording contraception.

Contraception: Birth control pills are hormone containing medications to prevent conception from occuring.