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.
Mace Windu leads an elite Jedi strikeforce against an army of trained killers in a demonstration of Jedi power and resolve... Aayla Secura must confront her former Master in an effort to retrieve the plans for a weapon that has already destroyed one world... Obi-Wan Kenobi and Anakin Skywalker must joins forces with a renegade Jedi to prevent a fleet of warships from falling into the hands of the enemy... On whatever field of battle the Jedi find themselves, their greatest challenge is to remain true to their teachings and to the ways of the Force!