What is third generation test tube baby? In vitro fertilization is an assisted reproductive technology that involves in vitro fertilization, commonly known as IVF. Its purpose is to combine a sperm and an egg outside the body to form an embryo, which is then implanted into the mother\’s uterus. IVF technology can be mainly divided into three generations. The first generation is the fertilization of sperm and eggs from both parents in the laboratory; the second generation