Li-Fi (Light Fidelity) is a bidirectional, high speed and fully networked wireless communication technology similar to Wi-Fi. Li-fi can deliver internet access 100 times faster than traditional wi-fi, offering speeds of up to 1Gbps (gigabit per second). It requires a light source, such as a standard LED bulb, an internet connection and a photo detector.
With the use of light radiating diodes Li-Fi technology transfers data through wireless. Li-Fi is a new exemplar for photosensitive wireless technology to provide unprecedented connectivity within a localized data centric environment. There has been a complete shift in wireless technology due to increase demand for faster and more secure and protected data transmission.
In this new technology, you will be having a led at one corner which will be working as a light source and on the other corner a Light Sensor or a photo detector. Light Sensor detect light as soon as the LED light starts glowing and will give an output of either binary1 or binary0.
(+) One of the big advantage is Li-Fi (unlike wi-fi) does not interfere with other radio signals, so could be utilised on aircraft and in other places where interference is an issue.
(-) As the limitation, Li-Fi cannot be deployed outdoors in direct sunlight, because that would interfere with its signal.
Li-Fi strategy is to have the future where data for laptops, smart phones, and tablets is transmitted through the light in a room. I'm waiting !!!