An intrauterine device (IUD) is a method of birth control that is placed inside the uterus to prevent pregnancy. Hormonal IUDs release a type of progestin to prevent pregnancy. Copper IUDs do not use hormones to prevent pregnancy.

All IUDs have a plastic string that extends through the opening of the cervix into the vagina. The string allows a woman to check that the IUD is in place. It also allows a health professional to remove the device at the woman's request or at the end of its effectiveness (2.5 to 10 years, depending on the type).

The IUD is very effective at preventing pregnancy.