Li-Fi, which stands for Light Fidelity, like Wi-Fi, is the latest generation of wireless data transmission technology, but in this case using LED light.
First introduced in 2011 by Harald Hass in a presentation at TED Global, the main difference with Wi-Fi is that the frequencies used for communication are in the visible light spectrum, which has a number of interesting consequences in comparison with radio transmissions.
1. There is no conflict with any radio transmission in terms of interference due to occupation of the same spectrum.
2. The absence of radiomagnetic interference makes it promising for use in hospitals and aircraft, where interference poses safety problems
3. The signal is limited to the optical range, which ensures safe data transmission thanks to the light pulses of the LED lights.
4. Large transmitters can be created with much greater energy efficiency than radio stations
The only way to breach the system would be to be physically present in the environment where the light source is located.
In conclusion, it is plausible to think that, in the fairly near future, Li-Fi technology could flank, if not replace, Wi-Fi and 5G.
Sources: internet4things.co.uk