It turns a mess of internal sharepoint/wiki/confluence links into an easily memorable namespace that can be 'linked to' verbally or on post-it notes.
A common hostname is 'go', so when you launch some new programme, project or tool, you can put 'go/projectname', or 'go/toolname' in places like chat topics, email footers and presentation slides.
Applicable in larger places that end up with a mess of different documentation systems, and where trying to unify everything would be a waste of time.