Holodeck

A holodeck is a fictional virtual reality facility featured in the Star Trek universe. It is often used for recreational activities. The holodeck is often used to recreate familiar places, participate in interactive stories, and to practice a variety of sports and skills. In the Star Trek universe, Holodeck environments and people are created by the use of "hard light" holograms, which are confined to the holodeck or other areas with "holographic projectors."