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Up until the announcement, passkeys could only be saved to Google Password Manager on Android. Those passkeys could be used on other devices, but you'd have to scan a QR code with an Android device with the Android app to actually save them to your account.
With this update, you can now save passkeys to Google Password Manager via Chrome on Windows, macOS, and Linux devices. (The feature is currently still in testing for ChromeOS devices.) Once saved, passkeys are synced across all your devices and usable on any device with Google Password Manager.
What exactly is a passkey? Whereas a traditional password requires you to memorize a string of characters/numbers/symbols, a passkey is a pair of digital keys where one "public" key is stored on the service you want to access and one "private" key is stored on your device.
To log in, you simply unlock your Android device (with fingerprint, PIN, or pattern) or enter your Google Password Manager PIN (on desktop devices). Your private key is then sent to the service for authentication.
With passkeys, you no longer have to memorize a unique password for each
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