Have you ever heard of Li-Fi? Shame on me, but I had absolutely no idea about what it is. So, let's see, Li-Fi (light fidelity) is the next step in development of communication technology after Wi-Fi. To transfer data it uses… light. The light can be of different kind, i.e. it may belong to the invisible, ultraviolet or the visible part of the spectrum. It is said that the speed of transferring information will be unbelievably high. Thus, you'll be able to download movies, music or whatever you want in a few minutes.