Start with Why by Simon Sinek explores how great leaders and organizations inspire action by focusing on their purpose or "why" rather than just "what" they do or "how" they do it. Sinek introduces the Golden Circle framework, where "why" represents the core belief or mission, "how" is the process, and "what" is the product or service. The book emphasizes that people connect emotionally with the "why," fostering loyalty and trust. Using examples like Apple and Martin Luther King Jr., Sinek shows how leading with purpose drives innovation, engagement, and long-term success.