Explanation:

 • Li-Fi, or light fidelity, invented by German physicist and professor Harald Haas, is a wireless technology that makes use of visible light in place of radio waves to transmit data at terabits per second speeds—more than 100 times the speed of Wi-Fi.
• Li-Fi uses common household LED (light emitting diodes) lightbulbs to enable data transfer, boasting speeds of up to 224 gigabits per second.
• Li-Fi offers great promise to overcome the existing limitations of Wi-Fi by providing for data-heavy communication in short ranges. Since it does not pollute, it can be called a green technology for device-to-device communication in the Internet of Things (IoT).
• LI-FI meets the 3L criteria: low interference, low power and low maintenance.
• In addition, it has potential for the first two Hs of the three Hs of high data rates, high reliability and high affordability.
• Since Li-Fi relies on visual light and not radio waves as the carrier but the last one—high affordability—may be achieved only when volumes increase, as it has in the case of Wi-Fi.
• Li-Fi can also easily work underwater