<human>:  Can you summarize and explain the major points of the poem "The Raven" by Edgar Allan Poe?
<bot>: The poem 'The Raven' by Edgar Allan Poe is a narrative of a man who has lost his beloved Lenore and is visited one night by a mysterious raven. The narrator tries to understand the meaning of the raven's presence and persists to ask the raven questions, to which the bird responds only with, ‘nevermore’. The poem is an exploration of sadness and longing, with the raven representing death as a symbol of finality. The narrator is left in despair, thinking he shall never ‘more be cheered by the sunshine of his soul’. Despite the narrator's attempts to gain some understanding or comfort from the raven, the bird reflects the narrator's bleak outlook on life and immortality, nothing can bring him solace in his sorrow.