Is a biography is narrative written by one person about himself or herself?

That's partially true, but not entirely. Here's a breakdown:

* Biography: A biography is a non-fiction account of a person's life, written by someone other than that person.

* Autobiography: An autobiography is a non-fiction account of a person's life, written by that same person.

So, while a biography can be a narrative written about a person, it's not typically written by the person themselves.

Let me know if you have any other questions!