An iris scan does not identify who you are talking to. A fingerprint scan does not either. These are unique to an individual, if they were the person who set them up, then it is, in 99% of cases, a unique element to a person that can be used to authenticate them.
That's a whole of a lot better than a password, which can be shared by multiple people.
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Biometrics is identification, not authentication.
It identifies who you are talking to, which is not the same as confirming who you are talking to (verifying authenticity of identity.)
An iris scan does not identify who you are talking to. A fingerprint scan does not either. These are unique to an individual, if they were the person who set them up, then it is, in 99% of cases, a unique element to a person that can be used to authenticate them.
That's a whole of a lot better than a password, which can be shared by multiple people.