Pollyanna Whittier is the main character in the novel "Pollyanna," written by Eleanor H. Porter and published in 1913. She is an optimistic young girl who believes in finding something to be glad about in every situation. After the death of her father, Pollyanna moves to live with her strict aunt, Miss Polly Harrington, in the small town of Beverly. Pollyanna's positive attitude influences the people around her, helping them to see the brighter side of life. Her "glad game," where she finds joy in even the smallest things, becomes a central theme of the story, showcasing the power of optimism and kindness.