Versions, Staging and Testing
Every published link gets a versioned preview link.
When you click publish, Framer will always generate a new preview link for you:

You can find an overview of all versions in Settings → Versions where you can click on any of the links to go to that version.

Format
Framer versioned links are formatted the following way:
https://easygoing-avoid-880101-04a42c7db.framer.app/
https://<project>-<version>.framer.app/
Reliability
The versioned links are built statically, meaning they'll never change in the future. If that link works once, it will show the same result forever.