When an author is creating an adaptation of an old story, the intention is to mainly

appeal to a new audience
craft a new ending
introduce better characters
provide a moral to the story

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MsLit
appeal to a new audience

Adaptations are used in order to get a new group of readers interested in the story. This can be done by changing the surroundings of the stories--putting the original story in a new time period or changing some of the details about the characters to make them more relatable to different groups of people.