Magnet Links

Magnet Links

 Now a days whenever we download anything we mostly find magnet links and every time we have a doubt in our mind that what exactly Magnet Links are?


Answer to this Question is that Magnet Links are the links that lets you download a torrent directly in your BitTorrent client, instead of your browser. Most clients supports this (uTorrent, Vuze, rtorrent, whatever) and will get the relevant torrent data over the DHT network.
And DHT? It's a de-centralized peer to peer network that all modern clients join by default, even if they are currently not downloading any torrents. DHT can help you find peers and meta-data when you choose to start a torrent download.

    You might also have noticed that the tracker has been down lately? And that the upload page don't recommend trackers anymore! The development of DHT has reached a stage where a tracker is no longer needed to use a torrent. DHT (combined with PEX) is highly effective in finding peers without the need for a centralized service. If you run uTorrent you might have noticed in the tracker tab of your torrents that the [Peer Exchange] (PEX) row is often reporting a lot more peers than the trackers you might have for that torrent. These peers all came to you without the use of a central tracker service! This is what we consider to be the future. Faster and more stability for the users because there is no central point to rely upon.

Use
The most common use of magnet links is to link to a particular file based on a hash of its contents, producing a unique identifier for the file, similar to an ISBN or catalog number. Unlike traditional identifiers, however, content-based signatures can be generated by anyone who already has the file, and so do not need a central authority to issue them.

Typical Eg.
magnet:?xt=urn:sha1:YNCKHTQCWBTRNJIV4WNAE52SJUQCZO5C

where xt is parameter that means exact topic  

for more ref: imdb