Emperor Fluffy's Star Killer is the largest ship in the known universe yet very little is known of it's capabilities. It's forward cannons are formidable and are more than a match for any other war ship. In addition there are four large hangers down each side of the ship that can launch hundreds of droid fighter ships (seen below.)
There is no information at present to the purpose of the mid section of the ship or the type of propulsion used to power the ship.