Hyperspace

Hyperspace is a superluminal method of travel. It is an alternative "sub-region" of space co-existing with our own universe which may be entered using an energy field or other device. Hyperspace is a physical place that can be entered and exited. Once in hyperspace, the laws of general and special relativity do not behave in the same way when compared to normal outer space, allowing travelers through hyperspace to go great distances without being physically present in normal space and taking less time, measured from normal outer space, to travel said distance.

The technologies used to enter hyperspace are hyperdrive or jump drive, popular in the Star Wars and Stargate universes.

Star Wars
Hyperspace was an alternate dimension that was coterminous with realspace (reality), meaning that each point in realspace was associated with a unique point in hyperspace, and all adjacent points in realspace were adjacent in hyperspace as well. Additionally, every object in realspace—such as stars, planets, and asteroids—had its "shadow" counterpart in hyperspace. In hyperspace, the normal laws of space and time did not apply, and it could only be accessed through molecular displacement, which was achieved by breaking the speed of light via hyperdrives to travel across the galaxy.

Purrgil were a sentient species of starship-sized whales that lived in deep space, capable of traveling across different galaxies using intergalactic hyperspace lanes. The natural ability of the purrgil inspired sentients to develop hyperdrive technology.

The Eye of Sion was a large hyperspace transport ring outfitted to hold six gigantic hyperdrive engines, and was also capable of intergalactic travel.