the u is a pun on the scientific use of u to mean micro.
bittorrent allows you to download files from other people that are downloading it at the same time.
Traditionally, you could download a file just from the site that offered it. However, really popular file downloads would overwhelm the site, so everyone would have a hard time getting the file. bittorrent allows all the downloaders of a file to upload some of the file to other people trying to download the file at the same time.
Think of it like this. You have a 100 page book.
You rip up that book, and give one page to each of 100 different people.
Now, when someone ask for a copy of the book, they can go to each of the 100 people and just ask for a copy of one page, which is trivial to do, instead of asking one person to copy 100 pages, which is a pain.
Once they have talked to all 100 people, they will have a copy of the book. And as soon as you have at least one page, people can ask you for copies of those pages too.
So, everyone in the torrent becomes a downloaded and a contributor.
It spread a small amount of work over a lot of machines, versus normal downloading, which puts all the work on one of only a few machine.
Ironically, bittorrent works best when large numbers of people that are download a file.
Download:
http://www.mediafire.com/?rq55m5rvt58cfvm
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