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A "two factor authentication" method requires two methods instead of traditionally only one way (in which passwords are by far the most common) to authenticate the user when logging in.

The most common form of 2FA is TOTP, or simply put, a secondary password/code that is randomly generated every so often to prevent potential attackers from gaining access to your account should your primary log-in password is stolen. In most cases, TOTP implementations involve the use of having a mobile device as the place for the one-time password in most "authenticator" apps because it's convenient and makes adds a bit of difficulty (meaning the attacker has to obtain the password AND your phone to get to your account).

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