In the context of authentication, factors are typically categorized into three distinct types:
1. **Something you know**: This includes information that a user knows, such as a username, password, or PIN.
2. **Something you have**: This includes physical items that a user possesses, such as a smart card or a mobile device that might receive a code.
3. **Something you are**: This includes biometric identifiers, such as a fingerprint or retina


