Bluetooth

Bluetooth 4.0Bluetooth 5.0Bluetooth 2.0Bluetooth 2.1Bluetooth 2.1 + EDRBluetooth 3.0Bluetooth 4.1Bluetooth 4.24.0Bluetooth 5
Bluetooth is a wireless technology standard used for exchanging data between fixed and mobile devices over short distances using short-wavelength UHF radio waves in the industrial, scientific and medical radio bands, from 2.400 to 2.485GHz, and building personal area networks (PANs).wikipedia
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Wireless

wireless communicationwireless communicationswireless internet
Bluetooth is a wireless technology standard used for exchanging data between fixed and mobile devices over short distances using short-wavelength UHF radio waves in the industrial, scientific and medical radio bands, from 2.400 to 2.485GHz, and building personal area networks (PANs).
With radio waves distances can be short, such as a few meters for Bluetooth or as far as millions of kilometers for deep-space radio communications.

Bluetooth Special Interest Group

Bluetooth SIGassociate member of the Bluetooth Special Interest Group
Bluetooth is managed by the Bluetooth Special Interest Group (SIG), which has more than 35,000 member companies in the areas of telecommunication, computing, networking, and consumer electronics.
The Bluetooth Special Interest Group (Bluetooth SIG) is the standards organisation that oversees the development of Bluetooth standards and the licensing of the Bluetooth technologies and trademarks to manufacturers.

Ultra high frequency

UHFUHF bandultra-high frequency
Bluetooth is a wireless technology standard used for exchanging data between fixed and mobile devices over short distances using short-wavelength UHF radio waves in the industrial, scientific and medical radio bands, from 2.400 to 2.485GHz, and building personal area networks (PANs).
They are used for television broadcasting, cell phones, satellite communication including GPS, personal radio services including Wi-Fi and Bluetooth, walkie-talkies, cordless phones, and numerous other applications.

ISM band

ISM2.4 GHz13.56 MHz
Bluetooth is a wireless technology standard used for exchanging data between fixed and mobile devices over short distances using short-wavelength UHF radio waves in the industrial, scientific and medical radio bands, from 2.400 to 2.485GHz, and building personal area networks (PANs).
Cordless phones, Bluetooth devices, near field communication (NFC) devices, garage door openers, baby monitors and wireless computer networks (WiFi) may all use the ISM frequencies, although these low power transmitters are not considered to be ISM devices.

Bluetooth Low Energy

BLEBluetooth LELow Energy
Bluetooth Low Energy uses 2MHz spacing, which accommodates 40 channels.
Compared to Classic Bluetooth, Bluetooth Low Energy is intended to provide considerably reduced power consumption and cost while maintaining a similar communication range.

Frequency-hopping spread spectrum

frequency hoppingFHSSfrequency-hopping
Bluetooth uses a radio technology called frequency-hopping spread spectrum.
Adaptive frequency-hopping spread spectrum (AFH), a specific type of FHSS, is used in Bluetooth wireless data transfer.

Personal area network

wireless personal area networkPANWPAN
Bluetooth is a wireless technology standard used for exchanging data between fixed and mobile devices over short distances using short-wavelength UHF radio waves in the industrial, scientific and medical radio bands, from 2.400 to 2.485GHz, and building personal area networks (PANs).
A wireless personal area network (WPAN) is a PAN carried over a low-powered, short-distance wireless network technology such as IrDA, Wireless USB, Bluetooth or ZigBee.

Frequency-shift keying

FSKfrequency shift keyingAFSK
Originally, Gaussian frequency-shift keying (GFSK) modulation was the only modulation scheme available.
It is used by DECT, Bluetooth, Cypress WirelessUSB, Nordic Semiconductor, Texas Instruments LPRF, IEEE 802.15.4, Z-Wave and Wavenis devices.

Scatternet

The Bluetooth Core Specification provides for the connection of two or more piconets to form a scatternet, in which certain devices simultaneously play the master role in one piconet and the slave role in another.
The terms "scatternet" and "piconet" are typically applied to Bluetooth wireless technology.

Harald Bluetooth

Harold BluetoothHaraldHarold I of Denmark
The name Bluetooth is an Anglicised version of the Scandinavian Blåtand/Blåtann (Old Norse blátǫnn), the epithet of the tenth-century king Harald Bluetooth who united dissonant Danish tribes into a single kingdom.
The Bluetooth wireless specification design was named after the king in 1997, and the Bluetooth logo consists of a Younger futhark bindrune for his initials, H and B .

Headphones

headphoneearphoneearphones
Headphones connect to a signal source such as an audio amplifier, radio, CD player, portable media player, mobile phone, video game console, or electronic musical instrument, either directly using a cord, or using wireless technology such as Bluetooth, DECT or FM radio.

Wireless speaker

wireless speakersBluetooth speakerportable speaker
Bluetooth exists in numerous products such as telephones, speakers, tablets, media players, robotics systems, laptops, and console gaming equipment as well as some high definition headsets, modems, hearing aids and even watches.
The two most popular RF frequencies that support audio transmission to wireless loudspeakers include a variation of WiFi IEEE 802.11, while others depend on Bluetooth to transmit audio data to the receiving speaker.

Piconet

One master may communicate with up to seven slaves in a piconet.
A piconet is an ad hoc network that links a wireless user group of devices using Bluetooth technology protocols.

Handsfree

hands-freehands freebluetooth handsfree
Devices that are typically used for handsfree communication use Bluetooth as its wireless technology.

Headset (audio)

headsetheadsetsBluetooth headset
Bluetooth exists in numerous products such as telephones, speakers, tablets, media players, robotics systems, laptops, and console gaming equipment as well as some high definition headsets, modems, hearing aids and even watches.
Cordless bluetooth headsets are available and often used with mobile telephones.

Wi-Fi Direct

WiFi DirectDirectDirect Wi-Fi
Wi-Fi Direct was recently developed to add a more Bluetooth-like ad-hoc functionality to Wi-Fi.
The "pairing" of Wi-Fi Direct devices can be set up to require the proximity of a near field communication, a Bluetooth signal, or a button press on one or all the devices.

IEEE 802.11

802.11802.11b/g/n802.11b/g
Bluetooth and Wi-Fi (Wi-Fi is the brand name for products using IEEE 802.11 standards) have some similar applications: setting up networks, printing, or transferring files.
Because of this choice of frequency band, 802.11b/g/n equipment may occasionally suffer interference in the 2.4 GHz band from microwave ovens, cordless telephones, and Bluetooth devices etc. 802.11b and 802.11g control their interference and susceptibility to interference by using direct-sequence spread spectrum (DSSS) and orthogonal frequency-division multiplexing (OFDM) signaling methods, respectively.

Bluetooth stack

BlueZApache Mynewt NimBLEAutomotive Bluetooth
Linux has two popular Bluetooth stacks, BlueZ and Fluoride.

Dongle

donglesadapterElectronic Key
While some desktop computers and most recent laptops come with a built-in Bluetooth radio, others require an external adapter, typically in the form of a small USB "dongle."
The term has since been applied to other forms of devices with a similar form factor, such as adapters that convert ports to handle different types of connectors (such as DVI to VGA for displays, USB to serial connection, and in modern computing, USB-C to other types of ports, and Mobile High-Definition Link), USB wireless adapters for standards such as Bluetooth and Wi-Fi (the term "stick" or "key" is more commonly used to describe USB flash drives, as well as modern forms of dongles with slimmer form factors more akin to flash drives), and small form-factor digital media players that plug into HDMI ports.

Bind rune

bindrunebind-runebindrunes
The Bluetooth logo is a bind rune merging the Younger Futhark runes (ᚼ, Hagall) and (ᛒ, Bjarkan), Harald's initials.

Digital Enhanced Cordless Telecommunications

DECTDECT 6.0DECT Standard Cipher
Like DECT, DECT ULE standard uses the 1.9 GHz band, and so suffers less interference than Zigbee, Bluetooth, or Wi-Fi from microwave ovens, which all operate in the unlicensed 2.4 GHz ISM band.

Computer mouse

mousemicecomputer mice
Cordless mice instead transmit data via infrared radiation (see IrDA) or radio (including Bluetooth), although many such cordless interfaces are themselves connected through the aforementioned wired serial buses.

DBm

Global Positioning System

GPSglobal positioning systemsGlobal Positioning System (GPS)
Receivers can interface with other devices using methods including a serial connection, USB, or Bluetooth.