What is the difference between egg freezing and embryo freezing?

Egg freezing preserves unfertilised eggs, stored without a sperm sample. Embryo freezing involves fertilising the eggs first and then freezing the resulting embryos. Egg freezing is chosen by single women or those without a partner, as no sperm is required at the time of the procedure. Embryo freezing is more commonly used by couples undergoing IVF, where both eggs and sperm are available. Both methods use vitrification and offer reliable long-term storage.