A narrative is basically telling a story.  There isn't much to the definition.  However, what's important about a narrative is that it helps us to learn lessons.  When it comes to narrative, it helps one support the larger arguments that they want to point out.  Also, narratives help tell personal stories that can relate to the audiences' experiences.
   It's important to know who your audience is when telling a narrative.  One wants to connect to their audiences through their narratives.  That's why the personal experiences can make the audience feel more comfortable with the narrator.  The narrator uses the lessons learned and experiences experienced to connect with the desired audience.  They tell their story.