She lay in the sand, she rolled in the sand, she found things in the sand to put in her mouth and ran away giggling when I tried to take them out. Sherubbed her face in the sand.And then she went and played in the water to really make sure she had become as one with the beac...
Backstory is simply what happened before the story. Writers often use backstory to introduce you to new characters. You get to know where they live, what they do, their habits.