The domain tag currently provides very little value, because it's an ambiguous term that refers to several unrelated concepts in vastly different fields. Based on a very quick look, it appears that most of the questions fall into one of three categories:
- questions about Internet domain names
- the software engineering concept of domains (a la domain-driven-design domain-model)
- the SQL notion of a domain, per
CREATE DOMAIN, as in To Domain or not to Domain
(Full disclose: I'm not well-antiquated with the latter two uses, so I don't know how related they are, if at all.)
These separate uses should probably get their own tags, and
[domain] should possibly be blacklisted to prevent further vague misuse.