What is biometric authentication?

Biometric Authentication is the act of establishing or confirming something (or someone) as authentic, that is, that claims made by or about the thing are true by use of a physical metric, such as a fingerprint to verify their identity. Authentication depends upon one or more authentication factors.

In computer security, authentication is the process of attempting to verify the digital identity of the sender of a communication such as a request to log in. The sender being authenticated may be a person using a computer, a computer itself or a computer program. A blind credential, in contrast, does not establish identity at all, but only a narrow right or status of the user or program.