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The Principle for 3-Factor authentication is
Something you have (like a smartcard)
Something you know (like a pin)
Something you are (like a fingerprint)
Then what is the 4th factor. Is it like 4D 🙂
I don’t think 4-factor authentication is a well defined concept – it’d just be called “multi-factor”.
Probably somewhere you are! You can only log in if you and device are in a certain location, for example.