"User Visits" definition

What does “User Visits” mean exactly?
If I go to the Discourse site, browse a bit, close the tab and come back an hour later in a new browser tab/window, while I am still the same person, same browser, will this count as 2 user visits or just 1?
What if I do the same, but my second visit is from a different device with the same user account?
What about users who are not logged in and only read? Do they count as user visits too?

Duplicate of