Intrauterine Devices (IUDs) are small, T-shaped contraceptive devices inserted into the uterus by a healthcare provider. They work primarily by preventing sperm from fertilizing an egg and can also inhibit implantation. IUDs are available in two main types: hormonal and copper. Hormonal IUDs release progestin, while copper IUDs use copper to create an environment that is toxic to sperm. IUDs are a long-term birth control option, effective for several years, depending on the type. They are over 99% effective and can be removed at any time if a woman wishes to become pregnant. Regular check-ups with a healthcare provider are recommended to ensure proper placement and address any concerns.