Fuchsia is a Google operating system that once only existed as a command line, but its latest updates have introduced a graphical user interface reminiscent of more modern smartphone operating systems. It's still unclear why Fuchsia exists and what Google's plans for it are.
New hints suggest Google is working on a new operating system behind the scenes. It's not yet clear what the OS may be used for, but it seems to be based on linux and geared toward embedded devices. The OS codename is Fuchsia.