Public health institutions are organizations that focus on protecting and improving the health of communities. They work to prevent disease, promote healthy lifestyles, and ensure access to healthcare services. Examples of these institutions include the World Health Organization (WHO), Centers for Disease Control and Prevention (CDC), and local health departments. These institutions conduct research, provide education, and develop policies to address public health issues. They also respond to health emergencies, such as outbreaks of infectious diseases, and work to improve health equity among different populations. Their efforts are essential for maintaining the overall well-being of society.