Article versions
Publisher’s PDF ( = Version of Record) = A version of an article as it appears in a journal.
Proof = a preliminary version of the final publication meant for review by authors, usually too "finished" for self-archiving.
Final draft = Author’s Accepted Manuscript (AAM) = post-print = post-review = A version of the paper or article that has been peer-reviewed and accepted for publication. It has not yet had the publisher’s layout and typesetting applied.
Final draft can be a Word-document or it can be written on a template.
Preprint = Article submitted to an editorial board, no acceptance for peer review process yet.
Publishers' self-archiving policies vary a lot:
Preprints are usually allowed for self-archiving, without embargoes.
The most of the publishers allow self-archiving of final drafts (with or without embargoes).
Some publishers allow also self-archiving of Publisher’s PDFs.
The University Library checks the archived version and possible embargo of each article. Please use SHERPA/RoMEO if you want to check the publishers' policies yourself.