The document provides an overview of disaster management. It defines disaster and classifies disasters into natural and man-made categories. The key phases of disaster management are presented as preparedness, response, recovery and mitigation. Preparedness involves planning and organizing resources for disaster response. Response requires immediate action to assess needs and provide relief. Recovery includes rehabilitation and reconstruction after a disaster. Mitigation aims to reduce risks and impacts of future disasters. The roles of nurses encompass education, emergency response and treatment, and coordinating resources across all phases of disaster management.