The age of widespread fingerprint and face-scanning authentication is almost here. Yet even in the age of Apple’s Face ID and Windows 10’s Hello, passwords are still the main way we log in to our various accounts. That’s why two-factor authentication (2FA) is still important.

What is two-factor authentication?

Two-factor, or multi-factor, authentication is an additional login code for an account—a second line of defense to your sensitive info. There are a number of ways you can get these short, secondary login codes. In a moment, we’ll take a look at some of the most popular methods for using two-factor authentication. Before we do that, however, here’s a quick review of what two-factor authentication is.

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What is two-factor authentication, and which 2FA apps are best?