Cryopreservation is crucial in fertility treatments, allowing for the freezing of eggs and embryos for future use. Recent advancements in vitrification have greatly improved the success rates of cryopreservation. By creating an amorphous state within cells, the likelihood of crystallization is reduced, leading to better cell survival after freezing and thawing. This process has revolutionized assisted reproduction technology, making procedures like single embryo transfer and preimplantation genetic testing possible. Understanding the vitrified state both inside and outside cells is key to improving cryopreservation techniques in reproductive medicine.