Bittorrents (also known as "torrents") work by downloading small bits of files from many different web sources at the same time. Torrent downloading is extremely easy to use, and outside of a few torrent search providers, torrents themselves are free of user fees.

First you need to download a BitTorrent client
The programs that you use to download files via the BitTorrent protocol are called BitTorrent clients.Find a torrent program that will suit your needs, the most common clients are uTorrent,BitTorrent,Vuze or KTorrent.There are plenty of other clients available as well.

Search for a good torrent
Go to a torrent site and search for a file you want to download.(Torrentz ,The Pirate Bay,Mininova, BTDigg, BTJunkie,isoHunt etc.. )

Download the torrent
Once you've found a good and healthy torrent, find the download link and download the torrent. Your browser will ask you what you want to do with the file, so be sure to tell it to open the torrent in the BitTorrent client you downloaded above.

Your BitTorrent client will open and (possibly) ask you where you want to save the file(s). Pick your save location, hit OK, and that's it; your file will begin downloading.

Read  : How to Download Torrent files on Your Mobile Phone

Tips and Warnings

Seeders (Seeds) [Upload]: Are people who have a complete copy of the torrent's files and are only uploading (sending) data to the people who are downloading (receiving).

Leechers (Peers) [Download]: Are people who are currently downloading the file. Leechers can become seeders after downloading the full file.

Keep your anti-virus program and its definitions fully up-to-date, downloaded software from 'sharing' sources carries a high risk of infection.

When looking for torrent files, prefer ones with plenty of Seeders so that the file downloads quickly.

Be warned the law is changing, and you could be tracked down for copyright infringement.