Sinek asks a powerful question: Why are some people and organizations more influential, innovative and successful than others? He argues that great leaders and movements all start with WHY — the purpose, cause or belief that inspires action. Through examples like Martin Luther King Jr., Steve Jobs and the Wright Brothers, he shows how starting with “why” rather than “what” or “how” leads to deeper engagement and sustained success. This 15th‑anniversary edition includes updates and a new foreword to reflect how the concept remains vital in today’s world.