BBY/ABY is used to position items along the Star Wars Timeline. BBY refers to Before the Battle of Yavin. ABY refers to After the Battle of Yavin. The Battle of Yavin in Episode IV: A New Hope occured in 0 BBY/ABY.
You are a bounty hunter. You are engaged in a fight to the death against a lethal squadron of battle droids. The droids' leader, Wuntoo Forcee Forwun, will stop at nothing in his quest to rule the galaxy. You must stand in his way. But be careful — the droids are not your only enemies. Other bounty hunters want to get to Forwun before you do. The reward is high — and the risks are extraordinary.