Iris scanning uses the unique patterns in a person's iris, which are determined before birth and remain stable throughout life, allowing for highly accurate biometric identification. An iris code using a mathematical algorithm represents each iris pattern, and no two codes are the same. Current uses of iris scanning include smartphones, airports, and government and military applications due to its accuracy and speed compared to fingerprint scanning. Future uses may expand to ATMs, healthcare, transportation, and other areas requiring security and user identification.