How to use Passkey as Roaming authenticator

When you create a passkey, it's associated with the website or app (the "relying party") and stored securely on your device. Many modern smartphones can act as roaming authenticators. This means you can use the passkey on your phone to log in to a website on your laptop, tablet, or even another phone. Passkeys are often synced across your devices through a secure service (like iCloud Keychain or Google Password Manager).