When using wireless Internet anywhere, whether it's your own or stolen from someone else, you're probably frustrated by the slowness of the Internet when more devices are connected to a single router. Due to the exponential increase in Internet users, the radio spectrum is crowded but the demand for wireless data doubles every year. Dr. Harald Haas has found a solution to this problem, which he calls “Data through Lighting.” Light Fidelity is a new class of high-intensity solid-state light sources providing lighting solutions specific to general and specialty lighting. Li-Fi is now part of VLC as it is implemented using white LED bulbs. Data transmission is carried out from this LED bulb by varying the current at extremely high speeds, undetectable by the human eye.I. INTRODUCTIONDr. Harald Haas coined the term Li-Fi and also promoted Li-Fi at his TED Global 2011 conference by demonstrating an LED bulb to transmit video at speeds greater than 10 Mbps. Simply put, Li-Fi can be considered light-based Wi-Fi because it uses light instead of radio waves to transmit information. Instead of Wi-Fi modems or routers, Li-Fi uses LED lights installed on a transceiver that can be used as light or for data transmission. This technology uses a visible spectrum and has no major harmful effects because we know that light is a real part of our lives. Furthermore, in this spectrum, 10,000 times more space is available and this is also 10,000 times more available than an already available bulb. Figure 1 shows the environment with Li-Fi technology where light bulbs are used as a communication medium. Figure 1: Environment with LI FI TechnologyII. WORKING TECHNOLOGY Li-Fi is implemented using ...... middle of paper ...... and can be put into practice, each bulb used to transmit a data and will lead towards a cleaner future, greener, safer and brighter. Li-Fi can solve problems such as lack of radio bandwidth and aims to create a new communication channel using existing equipment. The concept of Li-Fi is currently arousing a lot of interest, particularly because it could offer a real and very effective alternative to radio wireless. Works cited[1] An article on Li-Fi appeared in The Economist (January 28, 2012): Visible-light Communication: Tripping the light Fantastic - http://www.economist.com/node/21543470[2] International Journal of Applied Engineering Research, ISSN 0973-4562 Vol.7 No.11 (2012) © Research India Publications[3] http://www.liconsortium.org[4] http://www.ripublication.com/ijaer. htm[5] http://oledcomm.com/lifi.html