"Mediumship is the practice of purportedly mediating communication between familiar spirits or spirits of the dead and living human beings. Practitioners are known as "mediums" or "spirit mediums". There are different types of mediumship or spirit channeling, including séance tables, trance, and ouija"
source: https://en.wikipedia.org/wiki/Mediumship
Basically, mediums can communicate with the dead.
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