The Devil (from Greek: διάβολος diábolos "slanderer, accuser") designate the personification of evil in various cultures. In Abrahamic religions he is often identified with Satan. In Christianity he is the primary opponent of God.
Christianity identifies the Devil ("Satan") with the serpent who tempted Adam and Eve to eat the forbidden fruit, and describes him as a "fallen angel" who terrorizes the world through evil, is the antithesis of Truth, and shall be condemned, together with the fallen angels who follow him, to eternal fire at the Last Judgement.
Shaitan or Iblis is the Devil in Islam. While Iblis refers to the particular personified Devil, Shaitan can apply to any creature, that cause mischief and oppose God.
Some non-Abrahamic religions contain figures similar to the Devil, such as the Buddhist demon Mara and the Zoroastrian spirit Angra Mainyu....LESS