Preserving your fertility to allow treatment of a medical condition which may affect your future fertility - Some men and women are not able to have children due to the effects of medical treatment, such as certain types of cancer treatments. By identifying with a medical professional, your risk for infertility, you can take steps before treatment to help preserve your fertility.
Fertility preservation involves freezing and storing eggs, sperm, or embryos for use in a person’s future fertility treatment. In rarer cases, this can involve freezing and storing ovarian or testicular tissue
https://www.meandmummyindia.com/brief-profile.htm