The Galaxy-class was a Starfleet vessel first introduced in the late 2350s. It was one of the largest and most powerful Alliance starship classes of its time, with many serving in the timeline. This was the second known Galaxy-class starship, with the first being a little known class, which was in operation in the 2250s, that was mentioned in the Treaty of Armens. The Galaxy-class shared similar design characteristics with the smaller Nebula-class.
The Galaxy-class did not present any particular technological revolution, but was the culmination of several Starfleet technologies to date. One of the largest classes of ships constructed by Starfleet, it accommodated not just the crew but also their families and other civilians in spacious quarters, providing extensive recreational areas including the latest in holodeck technology. Intended primarily as a ship of exploration, its size and facilities allowed unsupported missions of up to a decade if necessary. In addition, it could effectively serve as a mobile starbase in the Federation's outlying territories, showing the flag and defending against encroachment by hostile powers.