The poem "Jabberwocky" by Lewis Carroll is a nonsense poem that uses made-up words and nonsense creatures. It tells the story of a young man who goes on a quest to slay the Jabberwocky monster after his father warns him of its claws and jaws. He finds and battles the Jabberwocky, cutting off its head with his vorpal blade. He then returns home victorious to the praise of his father. The poem uses nonsense words, creative language, and a simple plot to create a whimsical story.