A number of mobile phones have already brought this feature long before the iPhone X was released. But not Apple's name if they can not repackage with better ability.
Face ID, once Apple gave the name, presented as a replacement for the Touch ID. The company, led by Tim Cook, claims the FaceID feature is much safer than its fingerprint sensor. When the Touch ID has a 1: 50,000 error rate, then the Face ID is better, ie 1: 1,000,000.
This feature will automatically scan and confirm the user's identity without having to press the button. In order to have this capability, Face ID uses multiple artificial neural networks built into neural engines in the A11 Bionic processor to process face recognition data.
In the scanning process, Apple equips the iPhone X with TrueDepth Camera to deeply mapping faces, thus getting a detailed overview of all user faces.