There are single player campaigns for each race, and the game also supports up to 4 way multiplayer games.
Armada is very cool game.
If you're still playing this game, you'd do well to beam it aboard. Rally Point Improved Ships will not try to occupy the same location when they exit the shipyards. Strategic AI in Instant Action and Multiplayer has been given better handicaps on medium and hard difficulty. Including sped up build time and reduced cost. The Chain Reaction Pulsar weapon has been modified so that it will not be able to hit cloaked ships and has been balanced to be less powerful.