An implant is a medical device or material that is surgically placed inside the body to serve a specific purpose. These implants can range from simple devices like dental implants or intrauterine devices (IUDs) to complex devices like artificial joints or pacemakers. Implants are designed to improve or restore bodily functions, provide structural support, or deliver medications or substances directly to a targeted area within the body. They are commonly used in various medical fields, including orthopedics, cardiology, dentistry, and contraception, among others. The choice of implant depends on the patient's medical condition and the intended therapeutic or functional outcome.