Devil, also known as Lucifer or Satan, is the main antagonist of the Bible.
He is regarded by many religions as the supreme overlord of Hell and demons. Alternatively, he is also considered to be the living embodiment of evil, whose power is second only to that of God. Although Satan was originally a Judeo-Christian concept, almost all orthodox religions have an evil godlike (or semi-godlike) figure that can be said to be connected to Satan in their mannerism and purpose.
To some, Satan is nigh-omnipotent, whilst others limit his power to only corrupting or deceiving mankind. Some religions do not regard Satan as absolute evil, believing that he serves to test people's faith through suffering. However, in the popular mind, Satan will always embody the evil demonic influence in the universe, though, in the Bible, his role was outranked by evil humans themselves.