A reissue (or re-release) is a subsequent pressing of an album after the original production run has ended. Reissues can be straightforward represses of the original master, completely new remasters using modern technology, or expanded editions with bonus tracks, alternate takes, and updated artwork. They range from budget releases to premium audiophile editions.
For most listeners and new collectors, reissues are the practical choice. They're widely available, reasonably priced, and modern audiophile reissues from labels like Mobile Fidelity, Analogue Productions, and Blue Note's Tone Poet series often sound better than average original pressings — benefiting from advances in mastering technology and higher-quality vinyl formulations like 180g virgin vinyl.
When evaluating a reissue, research who did the remastering and where it was pressed. A quality reissue remastered from the original analog tapes at a respected mastering facility (e.g., Sterling Sound, Bernie Grundman) and pressed at a top plant (e.g., Quality Record Pressings, Optimal Media) will sound excellent. Avoid reissues sourced from digital masters when the original was analog — check Discogs and audiophile forums for details.
Mobile Fidelity Sound Lab's reissues are so respected that some sell for more than original first pressings of the same album.