The BFG (Big Friendly Giant) is the titular character from the classic children's story written by Roald Dahl. The world's only good giant (according to the story), the BFG, rather than snatching children out of their beds and eating them like other giants, distributes good dreams to children.
In the book, he takes a girl named Sophie from her orphanage one night after she sees him going about his duty and brings her back to his home in Giant Country. He assures Sophie that he won't harm her and tells her about himself and giant-kind. Sophie and the BFG come to know each other and become fast friends; Sophie then convinces the BFG to approach the Queen of England with a plan to stop the other giants from eating humans.
To this end, the BFG creates a nightmare, introducing knowledge of the man-eating giants to the Queen and leaves Sophie in the Queen's bedroom to confirm it true. Because the dream included the knowledge of Sophie's presence, the Queen believes her and speaks with the BFG. After considerable effort by the palace staff to create a table, chair, and cutlery of appropriate size for him to use, the BFG is given a lavish breakfast, and the Queen forms a plan to capture the other giants. She calls the King of Sweden and the Sultan of Baghdad to confirm the BFG's story – the giants having visited those locations on the previous two nights – then summons the Head of the Army and the Marshal of the Air Force. The said officers, though initially belligerent and sceptical, eventually agree to cooperate.
Eventually, a huge fleet of helicopters follows the BFG to the giants' homeland. While the people-eating giants are asleep, the Army ties them up, hangs them under the helicopters, and (after a brief struggle with the largest and fiercest of the giants, known as the Fleshlumpeater), flies them to London, where a special pit has been constructed from which they will not be able to escape. With thousands watching closely, the BFG unties the giants, then feeds them snozzcumbers (foul-tasting exaggerated cucumbers) which they will eat for the rest of their lives as a punishment for eating humans.
Afterwards, a huge castle is built to serve as the BFG's new house, with a little cottage next door for Sophie. While they are living happily in England, the BFG writes a book of their adventures, which is stated to be the same book in which the afore-mentioned story is narrated.
The BFG is not that big compared to other giants (he stands at 24 feet tall) or as strong, but he is fast and stealthy. He wears a cloak that can render him invisible and his huge ears let him hear even the faintest of whispers from a considerable distance.