Generally, pre-prints are manuscripts that have not yet been published, but may have been reviewed and accepted; submitted for publication; or intended for publication and being circulated for comment. Pre-prints may also be referred to as "e-prints". Many e-prints are electronic versions of research papers that have been submitted for dissemination and review among peers; for publication in journals; or prior to presentation at conferences. Some preprint servers may define pre-prints as any electronic work circulated by the author outside of the traditional publishing environment.