What does Google's alternate code mean?

Google's backup code refers to the backup code in Google's two-step verification, which is usually used to replace SMS verification when mobile phones or other devices cannot receive the verification code. The alternate code is provided by Google, which is different from the dynamic verification code generated by Google authenticator. It is a group of pre-generated verification codes, and each verification code can only be used once, so it needs to be properly kept to avoid being stolen by others.

When you use Google two-step authentication, if your mobile phone is lost, stolen or replaced, you will not be able to log in through the verification code, and the spare code will come in handy. To use spare code, you need to keep the spare code in a safe place and use it at any time. When you need to use alternate codes, you only need to enter one of them in the login interface to pass the verification. This code can only be used once, please use it carefully.

To get the spare code, you need to log in to your Google account and find the "two-step verification" option in the security settings options. On the Two-Step Verification Settings page, find the Alternate Verification Code option. After clicking this option, the system will generate a set of alternative codes and save them locally. Alternate codes cannot be changed or retrieved. Please make sure to keep them safely in a local or paper backup after obtaining them.