Satan (Hebrew "the accuser" and "the adversary") - both from the Semitic root: S-I-N) is an embodiment of antagonism that originates from the Abrahamic religions, being traditionally considered a "fallen" angel in Judeo-Christian belief, and a Jinn in Islamic belief. Originally, the term was used as a title for various entities (humans, accusing angels, etc.) that challenged the religious faith of humans in the Hebrew Bible. Since then, the Abrahamic religions have used "Satan" as a name for the Devil, king of demons. See also, witchcraft, angels, Bible, Christian, pagan, hauntings and vampires.

The Talmud mentions the Satan in many places. In all of these places, the Satan is an agent of God, and has no independent existence. Sometimes the Satan is conflated with various demons, such as Asmodai. At times there is even some sympathy for him. Commenting on the Book of Job, the rabbis express sympathy that his job was to "break the barrel but not spill any wine."

In Kabbalistic literature and its derivative, Hasidic literature, the Satan is seen as an agent of God whose job is to tempt one into sin, and then turn around and accuse the sinner on high. An additional understanding of Satan is from a parable to a prostitute who is hired by the King (God) to tempt his son (a Jew). The prostitute has to do the best she can to tempt the son; but deep down she hopes the son will pass the test. Similarly, Kabbalistic/Hasidic thought sees the Satan in the same situation. His job is to tempt us as best he can; turn around and accuse us; but deep down his wish is that we would resist his blandishments.