A need is something that is necessary for organisms to live a healthy life. Needs are distinguished from wants because a deficiency would cause a clear negative outcome, such as dysfunction or death. Needs can be objective and physical, such as food, or they can be subjective and psychological, such as the need for self-esteem. On a social level, needs are sometimes controversial. Understanding needs and wants is an issue in the fields of politics, social science, and philosophy.
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. In his theory, he proposed that people have a hierarchy of psychological needs, which range from security to self-actualization. However, while this model is intuitively appealing, it has been difficult to operationalize it experimentally. It was further developed by Clayton…