The "Big Friendly Giant" is a children's book written by Roald Dahl. It tells the story of a gentle giant who befriends a young girl named Sophie. Unlike other giants, he does not eat humans; instead, he collects dreams and shares them with children. The giant lives in a magical land and uses a special trumpet to blow dreams into the minds of sleeping children. Together, Sophie and the giant embark on an adventure to stop the other giants, who are not friendly and pose a threat to children. The story emphasizes friendship, bravery, and the power of dreams.