Wi-Fi revolutionized the way we connect to the internet, but it’s not without flaws. Researchers have been busy looking for new kinds of technologies that could offer more reliable alternatives. One is called Li-Fi (Light Fidelity). Back in 2011, a group of scientists led by Professor Harald Haas from Edinburgh University in Scotland introduced the idea of “Wireless data from every light” during a TED Talk. The general term is visible light communication (VLC) and is similar to the Morse code; it dates back to the 1880s and includes any use of the visible light portion of the electromagnetic spectrum to transmit information. Li-Fi is a type of visible light communication system that runs completely on wireless communications by means of travelling at very fast speeds. Confusing or not, this emerging technology is projected to expand its market worth to $80 billion by 2021. So let me explain. Wi-Fi and Li-Fi are pretty similar—they both provide the same means of transmitting data electromagnetically; yet, Wi-Fi utilizes the usage of radio waves, while Li-Fi runs solely off of the visible light. Even though invisible to the naked eye, waves are transmitted from our devices, carrying bits of data that allow us to browse the internet. There is a constant communication with towers called cellular radio masts. According to the founder of Li-Fi, Harald Haas, there are approximately 1.4 million cellular radio masts worldwide. Li-Fi replaces this bulky infrastructure with a solution relying on LED lights that send data over visible light via pulses undetectable by the human eye. Moreover, on the electromagnetic spectrum the spectrum of visible light is 10,000 times as big as that of radio-waves, said Haas. Unlike Wi-Fi signals, which can penetrate walls, Li-Fi is based on light and can’t, so theoretically,...