Bluetooth was created by Ericsson in 1994. It is a wireless technology that enables devices to communicate with each other.Unlike Wi-Fi, which is used for wireless communication on a network, Bluetooth is used for peer-to-peer communication between devices.    

Current Bluetooth device can have a distance reach of 60 meters, and transmit data at the speed of 25Mbps. Bluetooth and Wi-fi does share some similarities; for instance, both use radio frequencies (RF) to transmit data. 2.4Ghz to 2.485Ghz are the range of radio frequencies that are used by Bluetooth.

Devices take on the role of master or slave. For most Bluetooth networks, that are also called Personal Area Networks (PAN), there is one master and multiple slaves. The master communicates with the each slave in what is called a round-robin fashion. Because slave devices are constantly checking in with the master device, it is difficult for slave devices to have more than one master.

There have been a few security concerns with Bluetooth. One example is called bluejacking, where messages are sent to  devices without the users’ approval. There are also incidents where cell phones were taken over and international calls were made at the owners’ expense. 

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