What is the identification of a user based on a physical characteristic, such as a fingerprint, iris, face, voice, or handwriting?

Biometrics

Explanation:

Biometrics -

It refers to the method to detect any individual on the basis of face, iris, fingerprints, voice and handwriting, is referred to as biometrics.

The method is most commonly employed for the purpose of attendance of the people entering or leaving the respective place.

As each person have different voice, face, fingerprint, hence faking a biomerics is very difficult.

Hence, from the given information of the question,

The correct answer is biometrics.