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Def. When signing into their online account, a user will enter their username and a password  Then, instead of immediately gaining access, they will be required to provide another type of authentication to confirm their identity, that is called 2FA. (sometimes referred to as twostep verification or dual factor authentication).

There are several types of 2FA methods in use today; some may be stronger or more complex than others, but all offer better protection than username and passwords alone.