In the story "How the Grinch Stole Christmas," the Grinch is a grumpy creature who lives on a mountain above the cheerful town of Whoville. He despises the joyful Whos and their festive celebrations, especially during Christmas. Determined to stop their happiness, he devises a plan to steal all their presents and decorations on Christmas Eve. Disguised as Santa Claus, the Grinch sneaks into Whoville and takes everything that symbolizes Christmas. However, when he hears the Whos singing joyfully despite their losses, he realizes that Christmas is more than just gifts. This revelation transforms his heart, and he returns everything, embracing the true spirit of the holiday.