I have never read about this before. Sounds interesting, but do not think that I will use it myself. AndroidPolice is a nice site and provides a summary for its articles for people who already know the field in general.

Here it is:

• Samsung introduces factory reset protection on its Galaxy Watch series, ensuring thieves cannot use the device if it is stolen.
• Users can add an extra layer of security by setting a pattern or PIN lock on their Galaxy Watch, which must be entered again after a factory reset.
• In case the pattern or PIN is forgotten, users can bypass the factory reset protection by verifying their identity using their Google account password or biometric scanner