Answer:
A facial recognition system is a computer application or device that can identify individuals based on their unique facial characteristics. Unlike many other identification methods (e.g., fingerprints, voiceprint, signature), they do not need to make direct contact with an individual in order to verify their identity. This can be advantageous in clean environments, for surveillance or tracking, and in automation systems.
Because the system keeps a reference model of the individual, and captures their image for identification, there may be concerns about how the system is perceived by its users. They may also be more error-prone when identifying individuals, due to the fairly recent development of the technology. In addition, if used for security purposes, it is considerably more expensive and complex than other methods, such as mechanical locks, passwords, or identification cards.