Source: Windows Central On Windows 10, if you keep sensitive files on your device, it is crucial to take the necessary steps to protect them, and this is when BitLocker comes in handy. BitLocker is a feature that has been around for a long time, and it provides a way to encrypt the data on the hard drive to prevent unauthorized access to your information. In a nutshell, encryption is the process of making any data unreadable without proper authorization. When you use encryption to scramble your data, it will continue to be unreadable even when sharing it with other people. Only you with the proper encryption key can decrypt the data to make it usable.