What is "simearth"

SimEarth: The Living Planet is the second life simulation video game designed by Will Wright, in which the player controls the development of a planet. The game was published in 1990 by Maxis. Versions were made for the Apple Macintosh, Commodore Amiga, IBM PC, SNES, Sega Mega-CD and TurboGrafx-16. It was also subsequently re-released on the Wii Virtual Console.