An autobiography is a book about the life of a person, written by that person. The form of autobiography goes back to antiquity. Biographers generally rely on a wide variety of documents and viewpoints; an autobiography, however, may be based entirely on the writer's memory. Closely associated with autobiography (and sometimes difficult to precisely distinguish from it) is the form of memoir.— Excerpted from Autobiography on Wikipedia, the free encyclopedia.
A memoir forms a subclass of autobiography – although the terms 'memoir' and 'autobiography' are almost interchangeable in modern parlance. Memoir is autobiographical writing, but not all autobiographical writing follows the criteria for memoir.— Excerpted from Memoir on Wikipedia, the free encyclopedia.