Using a straightforward systems approach, Turnock's Public Health: What It Is and How It Works explores the inner workings of the complex, modern U.S. public health system—what it is, what it does, how it works, and why it is important. Divided into two parts, Part I of the text focuses on the key elements of public health practice in 21st century America, while Part II offers case studies designed to emphasize what public health is and how it works in everyday practice. Collectively, this text gives students an understanding of the key concepts underlying public health as a system and social enterprise while enabling them to practice their knowledge with real-life public health problems, programs, and initiatives. The Seventh Edition introduces the concept of "Public Health 3.0", with its new set of recommendations for updated public health practice in the 21st century and forms a unifying thread through the first six chapters of the book. A new 4-page appendix - in both the text and the eBook - addresses pandemic preparedness and the response to COVID-19. Other important updates include:• New conceptual frameworks for the public health system, the health systems' role in public health, and public health workforce have been added. • Six new case studies based on contemporary public health challenges including the passage of a "soda tax", state health improvement planning, and leadership in the era of Public Health 3.0. • Greater emphasis on health equity throughout the text. • Core MPH competencies are addressed including professionalism, leadership, systems thinking, health policy and management and program planning. • Additional charts and tables that help clarify concepts and assist visual learners. • Expanded "Outside-the-Book Thinking" exercises and new end-of-chapter discussion questions encourage readers to explore chapter concepts in greater depth.