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.
Rey and Finn escaped Jakku in the Millennium Falcon and teamed up with Han Solo and Chewbacca! But they're not in the clear yet — there be RATHTARS! Meanwhile, Kylo Ren meets with the mysterious Supreme Leader Snoke! The search for Luke Skywalker continues!