The Frankenstein monster is a fictional character created by author Mary Shelley in her 1818 novel, "Frankenstein; or, The Modern Prometheus." The creature is assembled from various body parts and brought to life by the scientist Victor Frankenstein. It is often depicted as a large, grotesque being with green skin and a flat head, but its appearance can vary in adaptations. The monster struggles with its identity and seeks acceptance from society, facing rejection and fear due to its appearance. This leads to themes of isolation, humanity, and the consequences of unchecked ambition, making the story a significant work in the Gothic literature genre.