The wedge-shaped Imperial Star Destroyer is a capital ship bristling with weapons emplacements. Turbolasers and tractor beam projectors dot its surface. Its belly hangar bay can launch TIE fighters, boarding craft, land assault units, hyperspace probes, or be used to hold captured craft. Its bustling bridge is staffed by the finest crewers in the Imperial starfleet.
The Star Destroyer is recognized as the signature vessel of the Imperial fleet. Its presence in a system marks matters of extreme Imperial import. Though, as is typical of the Empire, not even the Star Destroyer was enough to sate the Imperial hunger for displays of power. Larger vessels, such as the Super Star Destroyer, dwarf even these giants.
The rise of the Galactic Empire saw an unprecedented build up of military technology. The best officers from the Academy were drafted into service aboard Imperial Star Destroyers.
The Imperial Star Destroyer is the evolution of the Republic attack cruiser, a warship that saw extended action during the Clone Wars.
The legendary smuggling vessel has managed to outrun the big Imperial ships on several occasions. Captain Han Solo even was so bold as to land his ship within the blind spot of a Star Destroyer's conning tower to evade pursuit.
Darth Vader had at his disposal an entire fleet of Star Destroyers -- the Imperial Death Squadron -- as well as an immense flagship, the Super Star Destroyer Executor.
TIE fighters are short-range craft and lack a hyperdrive. As such, they must be ferried to combat zones aboard larger vessels. Imperial Star Destroyers carry squadrons of TIE fighters within their hangars, launching them from ventral bays.