Q. What are the different versions of publications? (Terminology)
Green OA = self-archiving - authors provide access to pre published or post published (with permission from the publisher) publications. Disciplinary repositories (ex. arXiv), institutional repositories (WIS).
Gold OA = publications open and accessed via the journal or publisher's website
Preprint = First draft. The paper submitted to publishers but it has yet to be peer reviewed or accepted.
Other terms: Author original, Author's version
Post-print = Peer reviewed version and accepted by publisher but not yet formatted by publisher.
Other terms: Accepted manuscript, Final draft
Published version = Final version. Published in a journal and formatted by the publisher.
Other terms: Publisher's version
Embargo = Delayed Open Access. Some subscription journals have all their content become open access after a certain amount of time has passed.
Go to SHERPA/RoMEO to check copyright policies about self-archiving for specific publishers.