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.
A daring rescue mission leads Lando—and his new friend Jaxxon—to the seat of Imperial power, where they must recover an important artifact that will inspire a planet to drive the Empire from their home.