How does the Raven?

"The Raven" by Edgar Allan Poe explores themes of grief, loss, and the descent into madness through the haunting visit of a mysterious raven. The poem depicts a sorrowful narrator who mourns the loss of his beloved Lenore, and the raven's repeated utterance of "Nevermore" symbolizes the permanence of his sorrow and the hopelessness of his situation. As the poem progresses, the narrator's mental state deteriorates, ultimately reflecting the torment of unresolved grief and the darkness of despair.