Embryo preservation is a process that involves freezing embryos for future use. This technique is commonly used in in vitro fertilization (IVF) to help individuals or couples who may want to conceive later. By freezing embryos, they can be stored safely for years until they are needed. The preservation process typically involves cooling the embryos to very low temperatures using liquid nitrogen. This prevents cellular activity and keeps the embryos viable. When ready, the embryos can be thawed and implanted into the uterus, increasing the chances of successful pregnancy.