A curtain was a fabric covering that concealed one's view. They often hung from windows, but could also be used to partition one section of a room from another for privacy.
Theater stages made use of curtains to ease the transition from one scene to another and allow the performers to get ready without being seen. (TOS: "The Conscience of the King")
The decontamination chamber aboard Enterprise NX-01 featured a curtain to separate male and females during the application of the decontamination gel. (ENT: "Bounty")
In 2375, disturbed by his view of void space from his quarters and unable to sleep, Neelix vowed to replicate himself some curtains first thing in the morning. (VOY: "Night")
In 2376, when Neelix told Tuvok that he was haunted by the nebula outside the windows of USS Voyager's mess hall, the Vulcan suggested Captain Janeway might give him permission to install curtains. Neelix seemed pleased with the idea, adding that he knew exactly the material to use. (VOY: "The Haunting of Deck Twelve")
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