is a facial recognition system
designed and developed by Apple Inc.
for the iPhone
(X, XR, XS & XS Max) and iPad Pro
(third generation). The successor to Touch ID,
the system allows biometricauthentication for unlocking a device,
making payments, and accessing sensitive data, as well as
providing detailed facial expression tracking
for Animoji and other features. Initially released in November 2017 with the iPhone X,
it has since been updated and introduced to all new iPhone and iPad Pro models.