Cybertron is an enormous planet-sized automated factory, home to the Cybertronians.
Located in the depths of space, far from galactic civilization, Cybertron isn't part of any solar system.
It is ruled by the Decepticons, whose careful management of the planet's limited resources long ago became draconian.
A Civil War between the Autobots and Decepticons put Cybertron under even greater strain.