The vast majority of data breaches from hacking are the result of compromised passwords. Passwords are not secure and cannot be relied upon. Multi-factor authentication is now a necessity. 

The FIDO (Fast Identity Online) Alliance, who’s members include Google, Microsoft, Mozilla, MasterCard, Visa and PayPal, have been working to define a secure and universally supported standard. 

U2F (Universal 2nd Factor) was the original FIDO specification which, as the name suggests, was aimed at providing a commonly used means of strong authentication in addition to username and password. By making direct use of widely used standard interfaces (USB, NFC, Bluetooth) FIDO authenticators do not require additional reader hardware.

FIDO2 is the more recent standard, in addition to supporting multi-factor authentication it also provides for secure passwordless multi-factor authentication. U2F specifications are now a part of FIDO2 for backward compatibility of the standard.

KEY-ID hardware security keys are FIDO-certified. It can be used with online services that have adopted FIDO2 like Google, Microsoft, Facebook, Instagram, and many others. 

There are two variants - FIDO2 Key with U2F and the biometric (fingerprint) Ezfinger2.