Multi-factor authentication (MFA) is a layer of security that requires users to verify their identity using two or more authentication factors. Authentication is how you prove that you are who you say you are. A factor refers to a type of evidence, typically falling into three distinct categories: Something you know: knowledge-based information such as passwords, PINs, or security questions. Something you have possession of: physical or digital resources that rely on direct access, like a sma...
