Authentication Factors or Authenticators, are essentially the means used to confirm the identity of a user, process, or device. Put simply, these are one or more things that a claimant/supplicant possesses and controls, and presents, to prove the claimant's identity. The following is/are categories of authentication factors:

Ownership Factors (something a supplicant has)

Knowledge Factors (something a supplicant knows)

Inherence Factors (something a supplicant is)

All of the above