Demons

A demon is a supernatural, often malevolent being prevalent in religion, occultism, literature, and folklore. The original Greek word daimon does not carry the negative connotation initially understood by implementation of the Koine δαιμόνιον (daimonion), and later ascribed to any cognate words sharing the root.

In Ancient Near Eastern religions as well as in the Abrahamic traditions, including ancient and medieval Christian demonology, a demon is considered an "unclean spirit" which may cause demonic possession, calling for an exorcism. In Western occultism and Renaissance magic, which grew out of an amalgamation of Greco-Roman magic, Jewish demonology, and Christian tradition, a demon is a spiritual entity that may be conjured and controlled.

In fiction
Demons figure prominently in many forms of television fiction; usually appearing in programs relating to the horror or supernatural fantasy subgenres. They are almost always presented in an antagonistic role and are often used as plot devices to help form the story structure of an individual episode or story-arc. The classifications, motivations and physical appearance of demons vary depending upon the material they are presented in and there are dozens of different types of demon, many of which are inspired by actual demonology, but are also developed exclusively by the imagination of the creator.