In March 2019, the World Wide Web Consortium (W3C) announced that WebAuthn is now the official web standard for password-free login. With support from a broad set of applications (Microsoft Edge, Chrome, Firefox, Mobile), widespread adoption of WebAuthn is expected in coming years. In a previous blog post we went through some examples of how WebAuthn can benefit your customer experience as well as strengthen your security posture. In this blog post, we will explore some of the critical technical building blocks and protocols that helped achieve the new standard. What is FIDO2? FIDO2 is a project that was executed by the FIDO Alliance and World Wide Web Consortium (W3C). The standard itself consists of the W3C Web Authentication (WebAuthN) browser API standard and the FIDO Client to Authenticator Protocol (CTAP). FIDO2 builds on previous work done by the FIDO alliance for the Universal 2nd Factor (U2F) authentication standard. FIDO2.