Torrent is a small file (around few kilobytes) with the suffix .torrent, which contains all the information needed to download a file the torrent was made for. That means it contains file names, their sizes, where to download from and so on. You can get torrents for almost anything on lots of web sites and torrent search engines.

Torrent is the most popular way of downloading large files, including movies and games 

If you want to download a file using torrent you must have a torrent client an application that need to be installed on your computer

Rapidshare Link

 Download Client from above link and install it into your computer now search for what you want in the web with a "torrent" keyword there are so many Torrent hosting sites 

Eg: piratebay,mononova.etc

search and find and download torrent.  One thing you have to remember is Download only files that have more seeds and less leechers so they can download files faster

after downloading open the file with Client it starts downloading

 Dont Forget to schedult the client otherwise it will download whenever there is Internet Connection