# [[YubiKey]]
![[YubiKey.svg]]
[site](https://www.yubico.com/products/)
Yubico YubiKeys are hardware [[Security key|security keys]] that provide another factor for [[MFA|Multifactor Authentication]] that is physical. A security key is "something you have", and it is best paired with "something you know" like a password or passphrase.
- [[How to generate an SSH key on the YubiKey for GitHub]]
- [[Setting a PIN on YubiKey]]
## Key types supported
A YubiKey can generate and hold three different types of keys.
- [[FIDO2]]/U2F: Used for [[GitHub]], [[Google]], [[Microsoft]], etc. A FIDO2 SSH private key lives in the YubiKey's FIDO app and you just have to touch it and put in the PIN. This is the streamlined way to create a key, but not all service providers support FIDO2.
- [[Personal Identity Verification]] (PIV): It's used for smart card logins, S/MIME, and can also be bridged into SSH. Keys live in numbered slots (9a, 9c, 9d, etc) and require a management key to write and a PIN to use. [[DigitalOcean]] uses this.
- [[OpenPGP]]: Often used with `gpg-agent` for SSH.
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