"The Compound Effect" is a self-help book advocating for achieving massive success through small, consistent actions over time. The author emphasizes the importance of making conscious choices, cultivating positive habits, and harnessing momentum to achieve goals. The book details strategies for identifying and eliminating negative influences, including bad habits and unhelpful relationships, and proposes building positive routines to create lasting change. Success, the author argues, is a marathon, not a sprint, requiring patience, persistence, and a willingness to exceed expectations.