Contraception or birth control are methods intended to be used to to prevent pregnancy. Contraceptives work in different ways:
1. Preventing sperm from getting to the eggs such as condoms, diaphragms, cervical caps, and contraceptive sponges.
2. Preventing the release of an egg such as birth control pills, patches, shots, vaginal rings, and emergency contraceptive pills.
3. Implants inside the uterus such as intra-uterine devices. (IUD)
4. Male of female sterilization to permanently prevent the man for ejaculating sperms of tubal sterilization to prevent the sperm from joining the egg