A supernatural and often malevolent being prevalent in religion, occultism, literature, fiction, mythology and folklore.
In Ancient Near Eastern religions as well as in the Abrahamic traditions, including ancient and medieval Christian demonology, a demon is considered a harmful spiritual entity, below the heavenly planes 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 Aggadah and Christian demonology, a demon is believed to be a spiritual entity that may be conjured and controlled.
Hindu beliefs include numerous varieties of spirits that might be classified as demons, including
Vetalas – A spirits inhabiting cadavers and charnel grounds. These corpses may be used as vehicles for movement (as they no longer decay while so inhabited); but a vetala may also leave the body at will.
Bhutas -A supernatural creature, usually the ghost of a deceased person, in the popular culture, literature and some ancient texts of the Indian sub-continent
Pishachas – A flesh-eating demon
Rakshasas/Asuras – Any supernatural spirit, either good or bad