When one reads a fictional story, one can still learn about non-fiction things. I do not necessarily mean in "creative non-fiction", but this is nearly found in any realistic fiction. For example, by reading one of Fyodor Dostoyevsky's fiction novels, one can discover what society was like in his place and time.
- The nearest word I can find to describe this is "subject matter", but I do not know if this accurately fits.
Is there a term used to describe this "non-fiction information" that can be taken from a story?