The difference between memoir and autobiography, as far as I see it, is that a memoir is there primarily to tell one particular story, whereas an autobiography tries to be a full account of a life.
This quote succinctly highlights the distinct purposes behind memoirs and autobiographies. Memoirs focus on specific moments or themes, offering an intimate glimpse into particular experiences, often shaped by the author's selective memories and emotional truths. Autobiographies, on the other hand, aim to provide a comprehensive overview of a person's entire life, presenting a broader narrative that encompasses various phases and events. Both forms serve as valuable tools for storytelling and self-exploration, but they differ in scope and intent, influencing how readers perceive and connect with the author's life journey.