Nursing is a profession within the healthcare sector focused on the care of individuals, families, and communities so they may attain, maintain, or recover optimal health and quality of life. Nurses may be differentiated from other healthcare providers by their approach to patient care, training, and scope of practice. Nurses practice in many specialties with differing levels of prescription authority. Nurses comprise the largest component of most healthcare environments; but there is evidence of international shortages of qualified nurses. Nurses collaborate with other healthcare providers such as physicians, nurse practitioners, physical therapists, and psychologists. Unlike nurse practitioners, nurses typically cannot prescribe medications in the US. Nurse practitioners are nurses with a graduate degree in advanced practice nursing. They practice independently in a variety of settings in more than half of the United States. Since the postwar period, nurse education has undergone a process of diversification towards advanced and specialized credentials, and many of the traditional regulations and provider roles are changing.

Nurses develop a plan of care, working collaboratively with physicians, therapists, the patient, the patient's family, and other team members that focuses on treating illness to improve quality of life. In the United Kingdom and the United States, clinical nurse specialists and nurse practitioners, diagnose health problems and prescribe the correct medications and other therapies, depending on particular state regulations. Nurses may help coordinate the patient care performed by other members of a multidisciplinary health care team such as therapists, medical practitioners, and dietitians. Nurses provide care both interdependently, for example, with physicians, and independently as nursing professionals. In addition to providing care and support, nurses educate the public and promote health and wellness.