For questions about Google+ Communities (themed groups) in the GSuite domain.
Google+ was discontinued by Google for consumer accounts on April 2, 2019. It's still available for G Suite accounts.
Google+ Communities are groups created on a specific subject that can be anything from gadgets to science fiction. A business can create a Google+ community around any subject of their choosing to engage other users on the network with an interest in that subject.
Reference: https://www.elegantthemes.com/blog/tips-tricks/your-ultimate-guide-to-google-communities