Nursing has evolved from an occupation to a profession through developing specialized knowledge and skills. It involves both the science of caring for individuals and an art of applying knowledge compassionately. As a profession, nursing meets criteria such as requiring advanced education and training, demonstrating high-level responsibilities, and being guided by a code of ethics. Nurses work in a broad scope of settings and play an important role in promoting health, preventing illness, and caring for those who are sick, disabled, or dying.