Biographies are often written by historians, journalists, or other professional writers who have researched the subject's life and work. Autobiographies, on the other hand, are written by the person themselves, and are often more personal and introspective.
Biographies can be about anyone, from famous celebrities to ordinary people. Autobiographies are typically written by people who have achieved some level of success or notoriety, or who have a compelling story to tell.
Both biographies and autobiographies can be valuable sources of information about a person's life and work. However, biographies may be more objective and well-researched, while autobiographies may be more personal and introspective.