It's Republic versus Empire, good versus not-so-good, and most importantly, player versus player onboard the legendary prototype Imperial ship, Voidstar. Sabres up, everyone!
This is what happens when two sides clash in BioWare's Star Wars: The Old Republic. The Imperial players want the information located in the data core at the heart of the Voidstar, and the Republic players want to keep them from getting there.
At least that's how it works in the first round. The Voidstar Warzone has both sides alternating between rounds, so the next time through the Republic wants the data, and the Empire must defend it. Eventually someone must win and access the data, but it doesn't really matter in the grand scheme of things, because this is an MMO. It's not like the Republic will gain access to new technology if they win; it's just a place to kill other players with a purpose, and I'm OK with that.