Final answer:
Implanon is an implantable birth control method that releases a progestin hormone to prevent pregnancy. It is inserted under the skin of the upper arm and is effective for up to 3 years.
Step-by-step explanation:
The implantable progestin etonogestrel, also known as Implanon, is a birth control method that involves inserting a flexible rod under the skin of the upper arm. This rod releases a progestin hormone that prevents pregnancy by changing the lining of the uterus, thickening cervical mucus, and sometimes stopping the ovaries from releasing eggs. The implant is effective for up to 3 years and needs to be inserted and replaced by a healthcare professional.