In current world, we all are using so many communication Technology either it may be wired or wireless, the population of the world became more larger and their requirement of the communication bandwidth is also needed more. In terrestrial communication sending and receiving the information is quite easy and the network can provide high speed data service at low cost but in underwater communication sending and receiving the information is quite difficult because radio waves cannot travel in underwater. Generally, water have conductivity in nature. Organic particles and optical properties are there, the solution for the communication in water is Light. We can send and receive the information using light fidelity in water. The future applications of Li-Fi could serve a much more purpose than just for underwater, airplane, and chemical plant usage.