what is accepted on our site and what not, how to deal with X
A policy is a deliberate system of principles to guide decisions and achieve rational outcomes. A policy is a statement of intent, and is implemented as a procedure or protocol.
So this tag shall be used whenever a question is about …
- Is X a valid question/answer?
- Do we deal with Y as topic?
- Do we permit Z in questions/answers?
And only for this kind of Meta-question. Using a dedicated tag for this makes it easier to find relevant details, so please make use of it :)
Also see: scope