Similar to Google’s two-factor verification, Yahoo’s second sign-in verification adds an extra level of protection for your Yahoo account. In the event that your account is accessed from an unrecognized device, Yahoo will require verification through your security question or mobile number.
Note, though, that certain apps, including the Mail apps on iOS and Android, don’t work with Yahoo’s second sign-in verification. For this reason, Yahoo is also implementing App Passwords.
If you can’t see the video embedded above, please click here.
An App Password is essentially a temporary auto-generated password that you can enter into the password field of an app that requires access to your Yahoo account. Once you do, the app and your device will be logged in and you need not enter the password again.
But if you add another app or device, you need to generate a new one-time App Password for it. And if you want to revoke access to an app or device, you can easily do so from your Yahoo account settings.
To get started with and learn more about second-sign verification and App Passwords, check out Yahoo’s video walk-through above.