Authenticator lets you create single-use passcodes to back up your account to your favorite cloud storage. This app allows you to create codes that are more secure than the usual usernames and passwords. It is compatible with many online services and websites.

To use the app, you first need to install it. You can download it from Google Play Store. After that, you can generate a code and save it. The next time you want to use it, you just need to open the app, enter the code, and you're done. It's that simple.