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.
When a valuable cargo freighter fails to reach its destination on the planet Coruscant, Qui-Gon and Obi-Wan are sent into deep space to search for the missing ship. Their investigation leads them to the distant, lawless world of Ord Mantell, where everyone carries a grudge and a blaster... and Jedi are less than welcome.