What is the file sharing program where you d/l small fragments from many...

[LesYeuxCommeLaMer]

...different users? A friend told me about this program, but I cannot remember the name. It is a file sharing program unlike Limewire. You download files in small fragments, each one from a different user.

 

[reason]

bittorent is the original program.
utorrent is the best current version.
the files are called "torrents"