A hologrid is a series of electronic imagers, forcefields and matter generators used to create an image or likeness of a scene. It is akin to "real life" in that it looks, and feels like normal reality, when in fact it is all being made up with photons.
Some starships in the late 24th century use holo-technology to create their viewscreens, these are known as holo-communicators. (DS9: "For the Uniform", "Doctor Bashir, I Presume")
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