Setting a biometric to unlock your lock screen only keeps strangers from accessing your phone. But it can't protect you when you hand over your unlocked phone to someone. Samsung's Secure Folder fixes that. It’s a separate, encrypted space on your Galaxy phone that has its own lock. It's one of the best privacy features that you can use on your Galaxy phone. The most interesting part is that most people never open it, including me (not now, though). In this guide, we'll share with you how Secure Folder works, how to set it up, and the best ways to use it.