https://techcrunch.com/2023/09/21/github-passkeys/

GitHub is formally launching its passkeys security feature into general availability, two months after first debuting it in beta.

Passkeys offer cloud-synced authentication using cryptographic key pairs, allowing users to sign-in to websites and apps with the same screen-lock PIN or biometrics they use for their devices, or a physical security authentication key. It essentially combines the security benefits of passwords and two-factor authentication (2FA) into a single step, making it easier for people to access their online services securely.