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.
Obi-Wan Kenobi and Anakin Skywalker take a junked speeder on a deadly race through a canyon teeming with bounty hunters, a duty bound clone trooper finds himself the sole defense against an army of droids, a free-spirited young Jedi is tasked with a dangerous mission of greater significance than she realizes, and a peaceful group of farmers find themselves on the frontlines in the fight against the Separatists - all in this action-packed collection of stories told in the super-popular stripped down stylization of the Cartoon Network micro-series!