Breaking down physical characteristics into mathematical models.

Biometrics are frequently compared based on their unique physiological or behavioral characteristics, and can be used in almost any application that requires the accurate identification of an individual. Ideally one person’s biometric shouldn’t be the same from sample to sample owing to the inherent variability of biometrics. A biometric set represents a passive biometric, like facial recognition, doesn’t require any action on the part of an individual. In the real world, a biometric is a mathematical model of a person’s physical characteristics.