"Paradise Lost" is an epic poem written by John Milton, first published in 1667. It's considered one of the greatest works of English literature and a seminal work of Western literature. The poem retells the biblical story of the fall of humanity, focusing primarily on the rebellion of Satan and the expulsion of Adam and Eve from the Garden of Eden.

The poem opens in medias res, with Satan and his fallen angels lying defeated in Hell after their failed rebellion against God. Determined to seek revenge, Satan sets out to corrupt God's newly created world and humanity, whom he views as favored over him. He succeeds in tempting Adam and Eve to eat from the forbidden tree, leading to their expulsion from Paradise.

"Paradise Lost" explores themes such as free will, disobedience, the nature of evil, and the consequences of human actions. Milton's portrayal of Satan as a complex and charismatic figure has sparked much debate among readers and critics, with some seeing him as a tragic hero and others as the epitome of evil.

The poem is renowned for its majestic language, intricate verse, and vivid imagery. Milton's use of blank verse, intricate syntax, and rich symbolism contribute to the epic grandeur of the work. "Paradise Lost" has had a profound influence on literature, philosophy, and theology, inspiring countless adaptations, interpretations, and critical analyses over the centuries.