Two-factor authentication (2FA), sometimes called multi-factor authentication (MFA), adds a second proof of identity beyond your password. If someone learns your password, that extra step can help prevent them from signing in.
## 1. Start with your most important accounts Prioritize your primary email account, password manager, financial accounts, cloud storage, and social accounts that can be used to reset other passwords. The exact options vary by service.
## 2. Open the account's official security settings Type the service's official website address yourself or use its official app. Find Security, Sign-in, or Two-step verification settings. Avoid following unexpected messages that ask you to “secure” an account through a link.
## 3. Choose the strongest practical option When available, consider a passkey or security key. An authenticator app is another good option. Text-message codes are generally better than no second factor, but they can be more vulnerable to phone-number takeover and phishing than phishing-resistant methods.
Follow the service's setup instructions carefully. You may need to scan a QR code with an authenticator app or register a device.
## 4. Save recovery options securely Many services provide backup codes or recovery methods. Store them somewhere safe and separate from the device you use to sign in. Never post codes publicly or share them with someone who contacts you unexpectedly.
## 5. Test the setup After enabling 2FA, sign out only if you know your password and have access to the new factor. Confirm you can complete sign-in and that recovery options are available.
## Watch out for scams Never tell a caller or message sender a one-time code. Real support staff should not need you to read out a login code to prove your identity.
Good security is layered: use unique passwords, a password manager, 2FA, software updates, and caution with unexpected links.
Official sources
For current instructions and details that vary by device or Windows version, consult CISA — More than a Password: Multi-Factor Authentication.
Menu names and available features vary by Windows version, hardware, and manufacturer. Before any step that could erase data or change security settings, read the warning and make sure important files are backed up.
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