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In Microsoft’s Security, Compliance, and Identity guidance, multi-factor authentication (MFA) is based on combining independent categories of credentials to verify a user. Microsoft describes the three factor types as: something you know (knowledge), something you have (possession), and something you are (inherence). A password is explicitly categorized as “something you know,” because it relies on a secret the user memorizes and types during sign-in. MFA improves security by requiring two or more of these distinct factors—e.g., a password (know) plus a phone approval or hardware token (have), or a biometric like Windows Hello (are). Using factors from different categories mitigates common attacks such as password spray, credential stuffing, and phishing, because compromising one factor (for example, the password) does not grant access without the second, unrelated factor. Microsoft recommends enabling MFA broadly and pairing passwords with stronger possession or inherence methods to achieve a measurable reduction in account compromise risk. Therefore, in the MFA model used by Microsoft Entra ID (Azure AD), a password is considered something you know.