Which genre uses narrative techniques to provide a glimpse into the human existence?

The answer is "short stories". Although this question may seem really intimidating, it is just a fancier way of saying "What type of literature has humans who narrate, or tell, the story? The story is short". The word "glimpse" implies short, and humans are always in short stories. If a story has animals or other beings narrating the story, it is probably a fable or fantasy. Hope this helps!