Biometrics, identification and authentication
Identification answers the question of 'who are you'. It aims to capture biometric data that can identify who you are. It can be a set of your fingerprints or your facial patterns. These biometrics can clearly and uniquely identify you. On mobile devices, for this purpose, there is a separate secure chip that runs completely independently on the main chip on the device. Its sole responsibility is the storage and processing of biometric data and authentication requests. The data never leaves the device. It cannot be tampered with. It is not even accessible for the authentication app.
Authentication aims to answer whether you are indeed the person who you claim to be. During authentication, your data is collected using biometric sensors and then it is compared to the data already stored on the device. If the resemblance is sufficient, you are authenticated.