In-Vitro Fertilization (IVF-ET) is popularly called test tube baby procedure. In-Vitro Fertilization means that fertilization of the egg with the sperm is established outside the body. 

So in any couple where eggs are withdrawn from the ovaries and are made to fertilize using husband’s sperm outside the body and the embryo thus formed is transferred back to the uterus, the couple is said to undergo IVF procedure. It was first utilized for a couple where the woman had lost her fallopian tubes due to previous ectopic pregnancy.