- Factor: different piece of evidence which proves the identity
- Factors:
- Knowledge: something we as users know: username, password
- Possession: something we as users have: bank card, MFA device/app
- Inherent: something we are, example: fingerprint, face, voice, iris
- Location: a location (physical) or which network we are connected to (corporate wifi)
- More factors means more security, harder to bypass by an intruder