what is a background for a narrative essay?

what is a background for a narrative essay?
I am in my basic english class in college and my final essay is due I kind of understand the structure of the essay but how in the world am i going to write a background in my intro paragraph and what is a background exactly?? please help

Narrative Essays

As a mode of expository writing, the narrative approach, more than any other, offers writers a chance to think and write about themselves. We all have experiences lodged in our memories which are worthy of sharing with readers. Yet sometimes they are so fused with other memories that a lot of the time spent in writing narrative is in the prewriting stage.