Two-factor authentification, also known as 2FA, gives your accounts additional protection. There are two factors of authentification. The first one is your password and email, and the second, is SMS sent to your phone, verification message, a phone call, a physical key etc. These are used to protect your account from being hacked, because this assumes that only you have access to the second-factor authentificator. Note that this is not foolproof, but a working method.
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