Are all autobiographies divided into chapters based on important events that define the aurthors life?

No, not all autobiographies are divided into chapters based on important events that define the author's life. While this is a common structure, there are other approaches:

* Chronological: Some autobiographies follow a strict chronological order, detailing events in the order they happened.

* Thematic: Some autobiographies focus on specific themes or periods in the author's life, like their career, relationships, or overcoming challenges.

* Narrative-driven: Some autobiographies tell a specific story, focusing on a particular experience or journey. These may not have distinct chapters based on events but follow a narrative arc.

* Non-linear: Some autobiographies use a non-linear structure, jumping back and forth in time or focusing on different aspects of the author's life without a strict chronological order.

Ultimately, the structure of an autobiography depends on the author's purpose and the story they want to tell. Some authors use chapters to highlight important events, while others prefer different approaches.