The IUD is a small, plastic device that is inserted by a physician / practitioner and left inside the uterus. Although there have been several types of IUDs, currently only two are available in the United States.
Combined oral contraceptives are commonly known as "the pill". They contain two man-made hormones called estrogen and progestin. The various brands of pills differ ONLY by the amount of estrogen in each pill and by the type and amounts of progestin.
Tubal ligation is a surgical form of sterilization. It is a permanent form of birth control. During the surgery, the fallopian tubes are blocked; this can be done by tying, sealing, or attaching a ring or clip to them.