Facial recognition is a technology capable of identifying or verifying a subject through an image, video or any audiovisual element of their face. Generally, this identification is used to access an application, system or service.

It is a form of biometric identification that uses body measurements, in this case the face and head, to verify the identity of a person through their biometric pattern and other data. The technology collects a set of unique biometric data from each person associated with their face and facial expression to identify, verify and/or authenticate a person.

The objective of facial recognition is, from the incoming image, to find a series of data of the same face in a set of training images in a database. The great difficulty lies in making this process happen in real time, something that is not within the reach of all identity verification software providers.