For questions about holodecks, in the "Star Trek" universe, a simulated reality facility located on starships and starbases; objects and people are simulated by a combination of transported matter, replicated matter, tractor beams, and shaped force fields onto which holographic images are projected. Always use in conjunction with the [star-trek] tag and any applicable work tags.

A holodeck, in the Star Trek universe, is a simulated reality facility located on starships and starbases. The first use of a "holodeck" by that name in the Star Trek universe was in the pilot episode of Star Trek: The Next Generation, "Encounter at Farpoint", although a conceptually similar "recreation room" appeared in an episode of Star Trek: the Animated Series. The concept of a holodeck was first shown to humans in an encounter with the Xyrillan race in the Star Trek: Enterprise episode "Unexpected".

The holodeck is depicted as an enclosed room in which objects and people are simulated by a combination of transported matter, replicated matter, tractor beams, and shaped force fields onto which holographic images are projected. Sounds and smells are simulated by speakers and fragranced fluid atomisers, respectively. The feel of a large environment is simulated by suspending the participants on force fields which move with their feet, keeping them from reaching the walls of the room like a virtual treadmill.

Starfleet personnel use holodecks for training, diagnostics and recreation. Holodecks are used to recreate or simulate settings and events for analysis, such as to explore the forensics and logistics of a crime scene for law enforcement purposes, or for scientific experimentation. In general, the holodeck "functions as a cultural repository of narrative possibilities that would normally be excluded from the ship's own sociohistorical moment" and "allows the Enterprise community to include even that which it excludes by containing the excluded within a proper, controlled place which in no way intrudes upon the everyday space of the ship." The Emergency Medical Hologram on ships such as USS Voyager applies holodeck technology to present a single "character" within the otherwise natural environment of the ship's sick bay.

In the X-Men comic book series, the X-Men train in the Danger Room. In the earliest version of this room depicted in the 1960s, the Danger Room used mere mechanical devices to simulate threats, but the version depicted following an upgrade by the extraterrestrial Sh'iar in the early 1980s utilizes sophisticated holograms, robots, and other sensory simulation to create environments as realistic as those on the holodeck. In the film X-Men: The Last Stand, the Danger Room's holography is shown to be a combination of light projection and solid objects.

Further reading

Source: Holodeck on the English Wikipedia.

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