What Is FIDO2? | Microsoft Security
https://www.microsoft.com/en-us/security/business/security-101/what-is-fido2
WebA FIDO2 key, also called a FIDO2 security key, is a physical hardware device required for two-factor and multifactor authentication. Acting as a roaming FIDO authenticator, it uses USB, NFC, or Bluetooth to connect to a FIDO2 client device, allowing users to authenticate on multiple computers, whether in the office, at home, or in another setting.
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