Anyone who’s done a fair bit of gaming will recognize the term “victory conditions.” They’re the way a game designer programatically defines what success is. Victory conditions can be simple, e.g.: “eliminate all hostile forces” or complex, “before turn 20, must have a unit under command control occupying any of the hexes between A-14 and A-20, inclusive.” When you do the thing that fulfills the conditions, you are a success.