A security key (ex: YubiKey) is a physical device that you can use instead of your user name and password to sign in. Since itâ€™s used in addition to a fingerprint or PIN, even if someone has your security key, they wonâ€™t be able to sign in without the PIN or fingerprint that you create. Security keys are usually available for purchase from retailers that sell computer accessories.
There are different types of security keys that you can use, like a USB key that you plug in to your device or an NFC key that you tap on an NFC reader. Make sure to familiarize yourself with the type of security key you have by reading the instruction manual from the manufacturer.
Starting with Windows 10 build 18298, you can now set up a security key straight from Settings that you can log you into applications.
This tutorial will show you how to set up a security key that can log you into applications for your account in Windows 10.