Richard Skolnik, lecturer at Yale and author of a leading global health textbook, walks through the concept of the burden of disease in this session of Essentials of Global Health. He opens with a survey of the state of world health, then introduces demographic measures such as fertility, mortality, and population age structure and shows how they shape health patterns across countries. The core of the talk works through what actually kills and disables people worldwide, from communicable to noncommunicable conditions, and traces these outcomes back to underlying risk factors and determinants like income, education, and behavior. Skolnik uses data and comparative country examples throughout to ground the abstract categories in concrete numbers. The lecture runs about half an hour and functions as a foundation for the rest of the course, giving viewers the vocabulary and framework used to discuss disease burden in later sessions.