The fox is one of the main characters . When he first meets the little prince, he's shy and timid, but then he's willing to sacrifice his freedom for the little prince to tame him. The fox feels that when the little prince tames him, he will be happy
The little prince is looking for friends but does not think the fox could be a friend. The fox explains friendship to him as a process of “taming” each other.
The little prince's meeting with the fox is the climax of the story . it's the moment when the little prince realizes why his rose is so important to him.
the fox knows the secret of life, he teaches the little prince the secret of life which he gives to the little prince as a present: "the essential is invisible to the eye, one can only see clearly with the heart."