A "fallen angel" typically refers to an angel who has been cast out of heaven due to rebellion or disobedience. This concept is often associated with religious texts, particularly in Christianity, where it is linked to the story of Lucifer, who defied God and was expelled from paradise. Fallen angels are often depicted as malevolent beings that tempt or lead humans astray. In literature and popular culture, fallen angels symbolize the struggle between good and evil. They often embody themes of redemption, loss, and the complexity of morality. This archetype can be found in various works, including John Milton's "Paradise Lost," where the character of Satan represents the ultimate fallen angel.