Healthcare and health are closely linked. Healthcare is the prevention, diagnosis, and treatment of illness, while health is a state of physical, mental, and social well-being. Healthcare is imperative to maintain and enhance the health of individuals, families, and communities. Healthcare encompasses a broad range of services, and includes activities like immunization, disease prevention and screening, and medical treatment. Healthcare systems strive to ensure access to quality care for all, and are an important part of promoting health and well-being in a population.