Allotransplantation is a medical procedure where an organ or tissue is transplanted from one individual to another of the same species. This type of transplantation is commonly used for organs like kidneys, hearts, and livers, as well as tissues such as skin and bone. The donor and recipient are usually not genetically identical, which can lead to complications. To prevent the recipient's immune system from rejecting the transplanted material, immunosuppressive drugs are often prescribed. These medications help the body accept the new organ or tissue, allowing it to function properly. Successful allotransplantation can significantly improve the quality of life for patients with organ failure or severe tissue damage.