Biography is a genre where the text is written about a person by another person. An autobiography, as the term suggests, is written by a person about her or himself. In the Library, these books are located in a subject section, where the person is famous for one thing, or perhaps for an invention, or taking part in a famous event, or for the job s/he does.
As well as these suggestions and recommendations, you can also look at the library catalogue here, where you can do a subject search, using the words: biography and autobiography, for further listings.