BB-8 is an astromech droid that appears on Star Wars Episode VII – The Force Awakens. It has a ball shaped body and a domed head that resembles that of the R2 series droids, whose most popular unit is R2-D2. BB-8’s body rolls independently from the head, which always stays near the vertical axis of the droid.

Like the R2 series, BB-8 also fits in the droid socket of an X-Wing starfighter. Specifically the T-70 x-Wing fighter model used by the Resistance thirty years after the Battle of Endor. BB-8 was first spotted on the desert planet of Jakku. Despite what most people think, several sources suggest that BB-8 is owned by Resistance’s pilot Poe Dameron.

http://www.howbb8works.com