Google Authentication is a separate app that provides additional security for your accounts. Google Authenticator generates 2-Step Verification codes on your phone. 2-Step Verification provides stronger security for your Google Account by requiring a second step of verification when you sign in. In addition to your password, you’ll also need a code generated by the Google Authenticator app on your phone. For more information, please refer to: https://play.google.com/store/apps/details?id=com.google.android.apps.authenticator2&hl=en_US