multi-factor authentication OpenSSH

sshd(8): Added support for multiple required authentication in SSH
protocol 2 via an AuthenticationMethods option. This option lists
one or more comma-separated lists of authentication method names.
Successful completion of all the methods in any list is required for
authentication to complete. This allows, for example, requiring a
user having to authenticate via public key or GSSAPI before they
are offered password authentication.

I found interesting article about Google authentication

Why multi factor authentication important? For example it is very easy to require  both an ssh public key and a password to login.   If you don’t have the public key, you will never see  the password prompt window.

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