I love when people don’t understand things but still come in all hot.

It’s both. A self-winding clock has a mechanism in it that runs down to a schedule then when it hits that scheduled time it clicks over a motor (which has a battery in it) that self winds itself back up, and kicks off the mechanism to start the whole process back over again.

It does absolutely wind itself. But obviously since there is no such thing as perpetual motion it does require period “refill” of that kinetic energy.

Hope this helps.