What Does 2FA Actually Mean?

Two-factor authentication (2FA) strengthens account security by requiring two distinct identity-verification factors, typically combining something a user knows, such as a password, with something they have or are, such as a phone-generated code, hardware token, fingerprint, or facial scan. A common login process begins with a username and password, followed by a second verification step before access is granted. This additional layer can limit damage from stolen passwords and phishing attempts because credentials alone are insufficient to enter an account. Common methods include SMS codes, authenticator apps using time-based one-time passwords, biometric verification, and physical security keys or smart cards. When single sign-on (SSO) is used, an identity provider such as Google may enforce 2FA centrally, allowing connected products to benefit from stronger authentication without independently implementing the feature.

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