The back story of 'The One and Only Ivan' is about a gorilla named Ivan who lives in a mall. He has been there for a long time, used to the routine of his small domain. He was captured from the wild when he was young. Over time, he befriends some other animals in the mall's makeshift zoo. This story is about his journey, his memories of the wild, and his hopes for a different kind of life.
One main element is Ivan's captivity. He's in a mall instead of his natural home. Another is his friendships, like with Stella and Bob. And his memories of the wild are also important.
Well, 'One and Only Ivan' isn't a true story. It's a work of fiction that brings to life unique characters and situations that are made up to engage and entertain.