A need is something that is necessary for humans 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 and water, or they can be subjective and psychological, such as the need for self-esteem. On a societal level, needs are sometimes controversial, such as the need for a nationalized health care system. Understanding needs and wants is an issue in the fields of politics, social science, and philosophy.

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