Why is world building important for futuristic and fantasy novels, and how

does the author's work in this area affect the experience of the reader?

I think this is probably something you should answer on your own, since it's not multiple choice.

Explanation:

I'm not an expert, but my vague explanation is that world building is important because it might shape how the character acts. The author's work in that area makes the story more realistic and relatable, most likely. But I haven't been taught the lesson, so I'm probably not accurate.