Hyperdrive

These delicate drives allow a ship to enter hyperspace, an alternate state of reality that allows travel at speeds many times that of light.
Hyperdrives are rated on a class scale of descending numbers that reflect the relative superluminal speed of a drive, with lower numbers denoting faster drives. Civilian hyperdrives are typically between class 3 and 4, with 10 being the slowest.
Most ships are equipped with a backup hyperdrive for use should the primary hyperdrive fail. These are typically exceedingly slow and are only really useful for short-range trips.