Final answer:
An implantable progestin etonogestrel, also known as Implanon, is a long-acting reversible contraceptive that is implanted under the skin. It prevents ovulation and thickens the cervical mucus.
Step-by-step explanation:
An implantable progestin etonogestrel, also known as Implanon, is a long-acting reversible contraceptive. It is a hormonal contraceptive method that is implanted under the skin. The progestin released by the implant prevents ovulation and thickens the cervical mucus, making it difficult for sperm to reach the egg.