Wireless communications has become an everyday utility for us, just like electricity. We use it in our private life and in business life as well. Till now data are being transmitted using radio magnetic waves, in particular radio waves. But it has limitations in terms of capacity, range, efficiency, availability, security and also very expensive. So scientists moved a step ahead and tried to find out a solution to overcome these limitations. They decided to use the visible light spectrum of Electromagnetic spectrum and they come up with Li-Fi. Visible light spectrum or simply light is all around us, it creates life so it is inherently safe. For transmission of data Li-Fi will rely on millions of LED bulbs which are available almost every households. LED bulbs has a property-its intensity can be modulated at a very high speed and it can be switched off at a very high speed. As a result we will have 10000 times more spectrum, so there will be no issue of capacity anymore. Data will be transmitted through illumination so it will be highly efficient and free. The energy efficiency will save hundreds of power plants. If we talk about availability light bulbs are everywhere, in hospitals, in streets, in aircrafts. It is all around us. Light cannot pass through a wall, no one even on the either side of a wall will able to read data. So it is very secured too.
Li-Fi is finally set to come out from research labs. Li-Fi is 100 times faster than Wi-Fi technology. Li-Fi, as mentioned above, uses visible light communication or infra-red and near ultraviolet (instead of radio frequency waves) spectrum, which carries much more information, and has been proposed as a solution to the RF-bandwidth limitations.
Professor Harald Haas, from the University of Edinburgh in the UK, coined the term Li-Fi. He is also recognised as the original founder of Li-Fi. In October 2011, companies and industry groups formed the Li-Fi Consortium, to promote high-speed optical wireless systems and to overcome the limited amount of radio-based wireless spectrum available by exploiting a completely different part of the electromagnetic spectrum.
So be ready to experience something like we have seen in Sci-Fi movies only.