The Imperial-class Star Destroyer (ISD) known generally as the Imperial Star Destroyer or as an Impstar, was a product line of massive dagger-shaped capital ships of the Imperial Navy and later the Navy of the First Order. It consisted of two variants, the Imperial I-class Star Destroyer and the Imperial II-class Star Destroyer

The Imperial-Star Destroyer replaced the smaller Venator-class used by the Galactic Republic during the Clone Wars and was generally the Galactic Empire's star cruiser of choice.[11]

At the height of its power, the Empire operated over 25,000 Star Destroyers.[8] The distinctive profile of the Imperial-class instilled fear into the soldiers of rebellious factions, and the name of a Star Destroyer could be preceded by the ship prefix ISD (standing for Imperial Star Destroyer). In a report to an admiral, Senior Commander Alecia Beck referred to the ISD Vehement.[12]

Roughly thirty years after the Battle of Endor, the new Resurgent-class Star Destroyers were constructed to replace the aging Imperial-class by the Empire's successor state, the First Order, and would borrow design philosophies from the highly respected and coveted ship