Magnet links can be distributed by email, messaging and other forms of communication but are most often found on the torrent sites that usually offer both torrent and magnet links to their users.
A magnet link therefore is theoretically all that is needed to download files from other peers in the Bittorrent network. It is a server-less way of retrieving the right information to start downloading the requested files. A Bittorrent magnet link has all the information needed to start downloading the files from peers directly.
