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.
The Force gives the noble Jedi Knights their power, but it can also be used by the fearsome Sith. In the never-ending battle between good and evil, who will control the power of the Force? This storybook spans the entire Star Wars saga and introduces readers to heroes like Luke Skywalker, Yoda, and Rey, as well as villains like Darth Vader, Darth Maul, and Kylo Ren!