Identical twins are two embryos formed from the same fertilized egg during division. Both embryos receive almost identical chromosomes and genetic material, so they have the same sex, look almost identical, and are almost identical in height, but their fingerprints are not exactly the same. Fingerprints are special chromosomal genetic expressions that are unique and are influenced not only by the environment during embryonic development (fingerprints on the human epidermis are formed when the fetus is about six months old) but also by the acquired environment, so identical twins’ fingerprints may be relatively similar, but usually not identical. Similar to fingerprints, twins may have similar looks, height, and genotype, but they are hardly identical, especially when their personalities are more influenced by their later life and may even be completely opposite. Two people are independent individuals with certain differences. Because of the uniqueness and uniqueness of fingerprints, they are the most important identification other than ID cards, so it is recommended to protect them well when it comes to privacy and security.