This lecture covers the definitions and importance of people-centered Early Warning Systems (EWS) for disaster risk reduction. It emphasizes the need for EWS to be accessible, timely, and tied to response actions. The lecture also discusses the challenges and elements of a people-centered EWS, such as risk knowledge, monitoring services, dissemination, communication, and response capabilities. It highlights the role of science and technology in improving EWS effectiveness and engaging communities in disaster preparedness.