Survey on Li-Fi: A Paradigm Shift in Data Transmission under VLC

Li-Fi (Light Fidelity) is the transmission of data through light, it is secure, efficient, and cheaper than other data transmission technologies such as Bluetooth, Wi-Fi, GiFi, etc. Also, data transmission in Li-Fi is around 100 × faster than the data transmission through Wi-Fi, i.e., it can send data at a very high speed. This chapter discusses the overview of Li-Fi, its characteristics, a comparison of various data transfer technologies such as Wi-Fi, Li-Fi and its applications such as underwater data transmission, its usage in thermal power plants, hotels, hospitals, malls, etc. and also contains its limitations and advantages over other technologies. Li-Fi technology has vast application and development potential because light is widely available and free. Each Li-Fi bulb could be used to transmit data if this technology matures. It would be a future communication system that is safer, greener, less expensive, and more cost-effective.