The theme of "Jack and the Beanstalk" is mainly good versus evil. In this fairytale, Jack is the embodiment of good and the giant is the embodiment of evil, and good triumphs over evil when Jack rids the world of the giant.
According to Humanities 360, although the theme of "Jack and the Beanstalk" is mostly about good versus evil, it is also more complex than that. There are other themes in this story, including bravery, courage and overcoming adversity. Jack must have a great deal of bravery to not only challenge a giant who is his superior in every way, but to eventually win. The story also deals with the concept and morality of revenge.
"Jack and the Beanstalk" is an English folktale that existed in oral form long before its first appearance in text. There are eight versions of the story, the first of which was published in 1807. It is closely related to and may originate from several similar tales told earlier, such as "Jack Spriggins and the Enchanted Bean" and "The History of Jack and the Giants." Some versions portray Jack as a hero who destroys a thieving giant, while other versions portray Jack as a mischievous boy who steals from the giant for no other reason than he feels like it, explains The Play House, an educational theatre company.