Help:Two-factor authentication - Wikipedia
Two-factor authentication (2FA) is a way to add additional security to your account. The first "factor" is your usual password that is standard for any account. The second "factor" is a verification code...
Two-factor authentication - Passport. Help
Two-factor authentication. You can set up your Yandex account so that you can only log in to it using This mechanism is called two-factor authentication (2FA), and it provides your account with a higher...
2FA Authenticator App (2FAS)
Two Factor Authentication. 2FA doubles the account's security by requiring a regular password and a Time-based One-time Password (TOTP). 2FAS App generates TOTP on the user's device.
What Is Two-Factor Authentication (2FA)? - Authy
Two Factor Authentication, or 2FA, is an extra layer of protection used to ensure the security of online accounts beyond just a username and password.
What is two-factor authentication and how... | Facebook Help Center
Two-factor authentication is a security feature that helps protect your Facebook account.