Nurse:
A nurse is a health care professional who is engaged in the practice of nursing. Nurses are responsible—along with other health care professionals—for the treatment, safety, and recovery of acutely or chronically ill or injured people, health maintenance of the healthy, and treatment of life-threatening emergencies in a wide range of health care settings. Nurses may also be involved in medical and nursing research and perform a wide range of non-clinical functions necessary to the delivery of health care.

Nursing education, regulation, roles, and titles vary in different countries, but in general reflect an increasing level of responsibility and status.