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McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The country code for Bhutan.
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BitTorrentA popular protocol for sharing large files over the Internet, developed by Bram Cohen in 2001 and available for all major platforms. There is no centralized server. Each BitTorrent user becomes a source for another user who wants the same file. The BitTorrent client balances the load on the user's computer because downloading is faster than uploading.
Widely used to transfer pirated movies and software, BitTorrent and other file sharing systems accounted for more than half of Internet traffic around the turn of the century. After movie streaming from Netflix, YouTube and other legal sources became popular, BitTorrent traffic dropped dramatically.
A torrent was originally a file of meta-data on a BitTorrent server that keeps track of where all the files are. In practice, torrent refers to any file transferred via BitTorrent, and large files are broken into smaller ones.
File sharing systems have been architected in different ways as outlined in the following illustrations. See peer-to-peer network, Napster and KaZaA.
|BitTorrent Leechers and Seeds|
|A "seed" is a BitTorrent client that has the file. A "leecher" is a BitTorrent client downloading, who then becomes a seed for someone else. However, a "leech" is a user who exits the program immediately after downloading to prevent being a seed. For more information, visit www.bittorrent.com.|
BluetoothThe standard wireless network technology for short-range transmission of digital audio and data from the Bluetooth Special Interest Group (SIG). The trademarked name and logo signify genuine Bluetooth technology (for more information, visit www.bluetooth.com).
Using radio waves, Bluetooth transmits through walls and other non-metal barriers. Although the term is synonymous with cellphone headsets and hands-free telephony in vehicles, Bluetooth is also used for wireless speakers, keyboards, mice, game controllers, smartwatches and more (for the different categories, see Bluetooth profiles). Constantly enhanced, see Bluetooth versions for version details.
Spread Spectrum Frequency Hopping
Bluetooth is a wireless personal area network (WPAN) that continuously changes its frequency. It randomly changes to one of 79 channels 1,600 times per second in the same unlicensed 2.4 GHz band as Wi-Fi. See spread spectrum.
Named after ancient King Harald Blatan of Denmark, Sweden-based Ericsson developed Bluetooth and co-founded the governing body in 1998 (www.bluetooth.com). Bluetooth is also an IEEE personal area network (PAN) standard (see 802.15). Supporting point-to-point and multipoint architectures (see piconet), there are billions of Bluetooth devices in use. See Bluetooth glossary.
|Bluetooth = Headset|
|Because they are were so ubiquitous, "Bluetooth" initially became synonymous with "headset." However, Bluetooth connects many other devices.|
|This "gamepad" from Sony uses Bluetooth to communicate with the PlayStation3 game console. See video game controller. (Image courtesy of Sony Corporation.)|
|This Oral-B toothbrush sends elapsed time to the app in the user's smartphone via Bluetooth to monitor brushing time and history.|
|The stylized "B" displayed on a modern smartphone (left) or earlier cellphone (right) means that Bluetooth has been turned on in the device.|
British TelecomThe earlier name of BT Group plc, which is the major telephone and Internet provider in England and Northern Ireland with operations around the world. It used to be a division of the British Post Office, but was privatized in 1984 under Margaret Thatcher's administration.
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