The BFG is a children's book written by Roald Dahl that tells the story of a young girl named Sophie who befriends a gentle giant. The giant, known as the Big Friendly Giant, collects dreams and shares them with children. Unlike other giants, he is kind and does not eat humans; instead, he consumes snozzcumbers and frobscottle. Together, Sophie and the BFG embark on an adventure to stop the other giants, who are not friendly and pose a threat to children. The story explores themes of friendship, bravery, and the importance of believing in the impossible.