Contraceptive implants are a type of long term birth control option. It a a plastic rod which is implanted in the upper arms under the skin. It releases progestin which prevents pregnancy. There are certain restrictions as to who can get a contraceptive implant so it is best to ask your heath care provider for more details.
Sources:
https://www.healthline.com/health/birth-control-implant#administration
https://www.nhs.uk/conditions/contraception/contraceptive-implant/
https://www.mayoclinic.org/tests-procedures/contraceptive-implant/about/pac-20393619