Final answer:
Hormonal contraception prevents ovulation by inhibiting the release of certain hormones. The most reliable method is hormonal implantation under the skin.
Step-by-step explanation:
Hormonal contraception involves the administration of hormones to prevent ovulation. There are different mechanisms of action for hormonal methods, but the main one is inhibiting the hypothalamus from releasing FSH or LH, which prevents an egg from being available for fertilization. The most reliable hormonal method is the implantation of the hormone under the skin, with a failure rate of less than 1 percent.