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Holodeck The generic name, especially in use aboard Federation starships, for
the "smart" virtual reality system as evolved by the 2360s — a
technology that combines transporter, replicator, and holographic
systems.
The programs, projected via emitters within a specially outfitted but
otherwise empty room, can create both "solid" props and characters as
well as holographic background to evoke any vista, any scenario, and
any personality — all based on whatever real or fictional parameters
are programmed.
While personal holoprograms relieve the stress and isolation of
shipboard life for crew personnel, Holodecks are also used for tasks
ranging from scientific simulation to tactical or even covert
training. Off starships, many commercial users have equipped
facilities with so-called Holosuites.
"Please state the nature of the medical emergency" says Voyager's holographic Doctor".