Public health agencies are organizations that work to protect and improve the health of communities. They focus on preventing disease, promoting healthy lifestyles, and ensuring access to healthcare services. These agencies often conduct research, provide education, and develop policies to address health issues. 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. They collaborate with governments, healthcare providers, and communities to respond to health emergencies, such as outbreaks of infectious diseases, and to promote overall public health initiatives.