This is a glossary of jargon related to peer-to-peer file sharing via the BitTorrent protocol.
.torrentfile is hosted. It shows if all pieces of the torrent are available to download (i.e. 50% means that only half of the torrent is available). Health does not indicate whether the torrent is free of viruses.
.torrentmetafile which can be used to identify a set of files for BitTorrent based on content, as opposed to referencing any particular tracker. The method is not limited to BitTorrent data. See Magnet URI scheme.