The ‘Hello’ feature in Windows means that you can you can use the new super secure biometric security features to keep your information safe.
If you want to use the biometric fingerprint detection or face recognition to log in to your PC with Windows 10 you can do so if you have the required hardware.
To use these features:
Go to Start > Settings > Accounts > Sign-in options (to explore the various available options available). Find out more about it on the Microsoft Support section here.