2. Introduction:
• BitTorrent is a Peer To Peer file sharing
Protocol used for distributing large
amounts of data over Internet.
• Accounts for approximately 43% to 70% of
all Internet traffic.
• BitTorrent is utilized by 150 million active
users(Jan ‘12).
• This method is the fastest means of
downloading media.

3. Brief History:
Programmer Bram Cohen designed the
protocol in April 2001 and released the
first available version on July 2, 2001.
It is now maintained by Cohen's
company, BitTorrent, Inc.

4. BitTorrent Terminology:
Seed: The one who have the complete file.
Leech: The one who is still downloading the file.
Peer: Either a seed or a leech. A peer is one
instance of a BitTorrent client running on a
computer.
Torrent file: The special file which has all the
information(metadata) about the file to be
downloaded.

5. BitTorrent Terminology:
Tracker: It is a server, which keeps track off all the
peers and assist in communication between them.
Swarm: Together, all peers (including seeders) sharing
a torrent.
P2P: Stands for ‘peer to peer’, is the technology used by
bitTorrent. Where each node acts as a both client and
server.
BitTorrent Client: The program that works on BitTorrent
protocol (Ex: uTorrent).

6. What is BitTorrent or simply torrent?
• BitTorrent is a way to transfer files of just about
any size, quickly and efficiently. Works on P2P
technology.
• It works by breaking up files into small pieces.
• The file is downloaded piece by piece from one
or many different sources.
• The name BitTorrent is also used to describe
the official BitTorrent client.

7. P2P Technology:
• A peer-to-peer (abbreviated to P2P) computer
network.
• In which each computer in the
network can act as a client or
server for the other computers in
the network.
• It allows sharing various resources such as files,
peripherals, and sensors without the need for a central
server.

8. Implementing BitTorrent:
What all do we need?
• A Client software
• Working Internet Connection.
• And a small ‘.torrent’ file.

9. Implementing BitTorrent:
How to start?
• Download and Install the torrent client.
• Download the appropriate ‘.torrent’ file for
the files to be downloaded.
• Click on the ‘.torrent’ file and the download
begins in the client.

10. How does BitTorrent work?

11. How does BitTorrent work?

12. How does BitTorrent work?

13. Torrent file:
• It has extension .torrent Torrent
• A torrent file stores metadata used
for BitTorrent.
• The only data that the torrent holds
is information about the location of
different pieces of the target file.
• Torrent file contains the URLs of many trackers

14. Torrent file:
Torrent

15. Other Techniques used with BitTorrent protocol:
PEX
DTH

16. What is the maximum speed we can achieve?

17. Advantages:
• It’s a efficient way of sending large files with
high speed.
• We can pause resume and again start sharing
• Better technology than sending file by
– Email attachment
– Online File Hosting
– FTP
• File can be shared easily over large no. of
users without need of Central Data Server.

18. Limitations:
• If there is no seeders then there is no
download.
• That’s why Old or unpopular files are hard to
download because nobody uploads them.
• At the beginning of the torrents life, download
speed is very low.
• A newbie might end up in downloading files

19. Video time:
Just so we could understand it better
BitTorrent Explained

20. End
Thank you!
By:
Balakrishna.K
(1CE09EC010)

21. Queries?
Feel free to ask.