Security is a major concern for all Wi-Fi users. This is due to the fact that the signals pass through walls and make Wi-Fi vulnerable to eavesdropping. Security is not an issue of concern in a Li-Fi environment since the visible light signal is confined to the indoor environment and it has high security. This would be a great advantage for business privacy and government installations. Furthermore, Li-Fi has the potential to significantly increase the speed of internet connection in multiuser indoor environments due to the broad bandwidth of the visible light, which ranges from 400 THz (780 nm) to 800 THz (375 nm).