Sorry if this is a dumb question (it feels like a dumb one) but I see a WP subdomain on a wordpress site and I’m not sure exactly the purpose of it. For example, [wp.example.com/example-URL](https://wp.example.com/example-URL)
There are lots of pages on this subdomain that are duplicates of the pages on the root domain and it seems like it’s supposed to be a stage or dev environment of some kind? But I’m not exactly sure. Is this standard for wordpress?