Biometrics authenticate using physical characteristics. FAR (False Acceptance Rate) = accepting imposters. FRR (False Rejection Rate) = rejecting legitimate users. CER = where FAR=FRR (lower = more accurate).
Biometrics can't be changed if compromised. Best combined with another factor. Face ID uses 3D infrared to defeat photo spoofing. Behavioral biometrics (typing rhythm, gait) are passive and continuous.