What's a passkey? The easy explanation - for anyone done with passwords

This article explains passkeys, a WebAuthn-based passwordless authentication method, detailing how they are created and stored, how authenticators (device-bound, syncable via password managers, or hardware keys) work, and how sign-ins occur using biometrics or a PIN. It emphasizes the security advantages over passwords—resistance to phishing, credential theft, and reuse—along with practical guidance on choosing authenticators, using multiple passkeys, and understanding that passwords may still coexist during the transition to a passwordless future.