What is an example of a knowledge factor used for authentication?

A security token is a type of possession factor, as it is a physical device or software that generates a code or provides access. Unlike knowledge factors, which rely on what the user knows, security tokens authenticate based on something the user has, making them different in function and application.

An ID card is also a possession factor used in authentication processes. It serves as a physical identifier that grants access to certain areas or systems. Similar to security tokens, ID cards do not rely on user knowledge; instead, they depend on the physical possession of the card by the user.

A fingerprint is an example of a biometric factor, which is based on inheritable physical attributes unique to an individual. This form of authentication contrasts with knowledge factors as it requires a physical trait rather than a secret piece of information that the user knows.