Called Li-Fi, it's a wireless internet technology that rapidly transmits data using flickering LED light fields between 400 and 800 terahertz. It's a process known as Visible Light Communication, which is like an advanced form of morse-code which, much like switching a torch on and off in a pattern that relays a message, the LED light flicks on and off at such extreme speeds that it can be used to write and transmit things in binary code.