In the journey of assisted reproductive technology (ART), in-vitro fertilization (IVF) has emerged as a transformative solution for individuals and couples striving to achieve parenthood. Among the various techniques in IVF, Frozen Embryo Transfer (FET) has gained remarkable prominence. Frozen Embryo Transfer, FET involves the cryopreservation of embryos and their subsequent thawing and transfer during a later menstrual cycle. Over the years, FET has demonstrated significant advantages, particularly in yielding higher implantation and pregnancy rates as compared to fresh embryo transfers. This article explores how FET has evolved, the scientific rationale behind its success, and its implications for reproductive medicine.