#7: WiFi or LiFi? What Kind of ‘Fidelity’?
in 1991. It operates by using a high-frequency radio signal. It is the router that sends the signals that carry the data to and from the Internet. The WiFi is limited only by the power of transmission, the antenna type, the location and the environment in general, example thick walls or very high buildings.
LiFi or ‘Light Fidelity’ was coined by Professor Herald Hass of Edinburgh in 2011 TED Talk. It is 100 times faster than its predecessor! However, it is good to note how it works. LiFi is based on a ‘visible light communication’, meaning that it needs light to work, and more precisely, LEDs. Data is transferred through the LED light beam and then, through a photo-detector (known as a photodiode), it is converted again by the receiver into elec-