Need

A need is something that is necessary for an organism to live a healthy life. Needs are distinguished from wants in that, in the case of a need, a deficiency causes a clear adverse outcome: a dysfunction or death.

Needs can be objective and physical, such as the need for food, or subjective and psychological, such as the need for self-esteem.

There are also needs of a social or societal nature.

Needs and wants are a matter of interest in, and form a common substrate for, the fields of philosophy, biology, psychology, social science, and politics.

Psychological definition

To most psychologists, need is a psychological feature that arouses an organism to action toward a goal, giving purpose and direction to behavior.

The most widely known academic model of needs was proposed by psychologist Abraham Maslow. His theory proposed that people have a hierarchy of psychological needs, which range from security to self-actualization. However, while intuitively appealing, this model has been difficult to operationalize experimentally. It was developed further by Clayton Alderfer.

Rescue

Rescue comprises responsive operations that usually involve the saving of life, or prevention of injury during an incident or dangerous situation.

Tools used might include search and rescue dogs, mounted search and rescue horses, helicopters, the "jaws of life", and other hydraulic cutting and spreading tools used to extricate individuals from wrecked vehicles. Rescue operations are sometimes supported by special vehicles such as fire department's or EMS heavy rescue vehicle.

Overview

Ropes and special devices can reach and remove individuals and animals from difficult locations including:

Rescue operations require a high degree of training and are performed by rescue squads, either independent or part of larger organizations such as fire, police, military, first aid, or ambulance services. In the U.S., they are usually staffed by medically trained personnel as NFPA regulations require it.