Answer: While fiction, sometimes takes you to the imaginative world, non-fiction unfolds the reality you get to know real people and their lives.
Explanation: Non-fiction enlightens one with a specific idea of subjectivity. It also gives knowledge in a specific subject which helps in learning new things. It provides you with facts.
The theme of a story is important because a story's theme is part of the reason why the author wrote the story. The author has a message he wants to share with readers, and he uses his story as a way to get that message across.