0day

0day or 0-day, as it relates to private trackers, is when a torrent is release within a day of release or before release. Most of the time however torrents are uploaded within minutes or even seconds of release.

Since most trackers get new releases within a day of release, a 0day tracker generally refers to trackers that have close connections with the scene and can release content from the scene servers to their tracker nearly instantaneously.