Public health agencies are organizations that work to protect and improve the health of communities. They monitor health trends, conduct research, and implement programs to prevent disease and promote healthy behaviors. Examples of public health agencies include the Centers for Disease Control and Prevention (CDC) in the United States and the World Health Organization (WHO) globally. These agencies also respond to health emergencies, such as outbreaks of infectious diseases, and provide guidance on health policies. They collaborate with local governments, healthcare providers, and community organizations to ensure access to health services and information for all populations.