Question

how does a Li-Fi works?

Answer 1

Light Fidelity or Li-Fi is a Visible Light Communications (VLC) system running wireless communications travelling at very high speeds. Li-Fi uses common household LED (light emitting diodes) light bulbs to enable data transfer, boasting speeds of up to 224 gigabits per second.
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Answer 2

When a constant current is applied to an LED (LED lamps are commonly found in households and offices nowadays), tiny packets of energy (called photons) are released, which we perceive as visible light. If the input current to the LED is varied slightly, the intensity of the light output also varies. However, the good thing is that such small variations in the intensity of light is imperceptible by human eyes. Since LEDs are semiconductor devices, the current and the optical output (the light produced by LEDs) can be modulated at very high speeds, which is then detected by a photodetector device that converts it back to electric current.

In this way, LiFi technology uses light from LED lights to transmit data and provide much faster Internet connectivity.

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