Umbilical cord blood is a biological material rich in hematopoietic stem cells, collected from the baby's umbilical cord or placenta after birth. This collected blood undergoes comprehensive testing before being stored under specific conditions in cord blood banks for future medical treatments. When a medical need arises, doctors consult these banks to find a compatible tissue match, and if a suitable cord blood unit is found, the transplantation procedure is performed in accordance with standard stem cell transplantation protocols.