An autobiography is the story describing a person's life that is told by the individual himself. Sometimes, an autobiography can be written with the help of a co-author, as long as the story remains in first-person.
A good place to find examples of other writers’ biographies is right here on The Write Practice. You can meet the Write Practice team on the About page. The Write Practice also includes bios with all guest posts (you can click on any post on this page to read the author’s bio).