(covers information from several alternate timelines)
Stealth technology was a description used of several types of technology used to remain undetected from sensors.
In 2404, Admiral Kathryn Janeway, from the alternate timeline, brought future stealth technology with her on her SC-4 shuttlecraft when she time traveled back to the year 2378. She intended the technology to be used on the USS Voyager, so that the ship could enter one of the Borg's transwarp hubs without incident. The stealth technology was however found to be incompatible with Voyager's systems by Seven of Nine. (VOY: "Endgame")
- Stealth (for specific examples)