Try google.
But since this copied to another page. I shall explain.
Spore is a game being developed by someone of whom I could not remember. It was shown at E3'05 as a PC "SIM" game (SIM as in The Sims). Where you grow your own genetical race. First by existing as a cell, where you fight with other cells to become a creature. Then you grow into the first creature. Then it finds a mate. Now you have a small race. They make a small settlement. Next thing you know, your controlling an empire. You fight to get your race to control the world. Now your taking over other worlds. Oh, but thats not all. Soon, your taking whole galaxies, then quadrants! And so on.
What's interesting, is that creations of other players, although they won't be commanded by the player, will be put the world your race inhabits, too. So you'll be fighting other player's creations. Pretty interesting.