Li-Fi-A revolution in the field of wireless-communication

In this current era where all the facilities that includes banking, shopping, online payments, games etc. can be accessed with internet, has lead to a drastic soar in wireless communication usage. The usable radio frequency spectrum is completely exploited and bandwidth re-use has begun to compensate with the increasing user demand. But, this re-use is shrinking the network and gap between user demands and network availability is increasing gradually. The visible light communication is the best solution for growing user demands. Li-Fi, is a innovative wireless communication system which uses VLC as a source of communication. The technology utilizes LEDs that help in the transmission of information much quicker than that of Wi-Fi. This technology is best for high density wireless data communication in restricted area and to overcome radio intervention problem. Li-Fi provides improved bandwidth, availability, efficiency and security and has already obtained very high speeds of about 10, 000 times more than the conventional Wi-Fi in the lab. By using the low cost LED lamps and light producing units we can use visible light bandwidth. This paper attempts to review basic concept of visible light transmission, how it is different from Wi-Fi, its applications in various fields, future usage, challenges and latest advancements over Wi-Fi.