First proposed by Albert Einstein and Nathan Rosen in 1935, wormholes are small irregularities in space-time that allow short cuts to far-distant regions of the universe. It could be possible for an advanced civilization to stabilize or create one to allow intergalactic travel, and even time travel.
Wormhole Term Timeline in A Brief History of Time
The timeline below shows where the term Wormhole appears in A Brief History of Time. The colored dots and icons indicate which themes are associated with that appearance.
...to achieve this speed. Perhaps space-time could be warped to allow a shortcut, allowing a wormhole between two regions; this would allow information from B to pass back to A faster... (full context)