Here's why:
* Direct Experience: Autobiographies are written by the person whose life story is being told. They are based on the author's firsthand memories, experiences, and perspectives.
* Original Insights: The information presented in an autobiography is unique and cannot be found elsewhere in the same way. It offers a personal and original interpretation of events.
* First-hand Account: While an autobiography may not always be completely accurate or unbiased, it provides a direct, unfiltered account of the author's life.
Example:
If you're studying the life of Nelson Mandela, reading his autobiography "Long Walk to Freedom" would be considered a primary source because it's his own account of his experiences and thoughts.