This is essentially the successor to the Nitrokey FIDO2. Updated with our latest Trussed Framework based on Rust. As mentioned in the text this is a device, which allows FIDO2-based authentication. So this Nitrokey will work with any website/service which offer U2F/FIDO2 and the latest marketing term (mainly pitched by the global players) is "Passkeys". Technically it will mostly be "passwordless", you always need to tell the service/website who you are, e.g. giving a username/login/e-mail - this is also by definition important, because you could also have two different passkeys for a single service by using two different usernames and both can be kept on such a Nitrokey Passkey.