Pollyanna is a best-selling 1913 book by Eleanor H. Porter that is now considered a classic of children's literature, with the title character's name becoming a popular term for someone with the same very optimistic outlook. Also, the subconscious bias towards the positive is often described as the Pollyanna principle. The book was such a success that Porter soon produced a sequel, Pollyanna Grows Up (1915). Eleven more Pollyanna sequels, known as "Glad Books", were later published, most of them written by Elizabeth Borton or Harriet Lummis Smith. Further sequels followed, including Pollyanna Plays the Game by Colleen L. Reece, published in 1997.

The main character is named Pollyanna Whittier, a young orphan who goes to live in Beldingsville, Vermont, with her wealthy but stern and cold spinster Aunt Polly, who does not want to take in Pollyanna, but feels it is her duty to her late sister. Pollyanna's philosophy of life centers on what she calls "The Glad Game," an optimistic and positive attitude she learned from her father. The game consists of finding something to be glad about in every situation, no matter how bleak it may be. It originated in an incident one Christmas when Pollyanna, who was hoping for a doll in the missionary barrel, found only a pair of crutches inside. Making the game up on the spot, Pollyanna's father taught her to look at the good side of things—in this case, to be glad about the crutches because "we didn't need to use them!"

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