A theory proposed by Abraham Maslow in 1943 describing human motivation as a progression of needs.
Basic needs have two parts:
Later, Maslow speculated on a sixth need for "transcendence", which a spiritual or religious need to be part of something beyond the individual.
Maslow argued that as a person progresses in their individual development, the needs higher up in the hierarchy become more important and dominant in that person's thinking. A highly developed person has their basic needs fully met, and spends most of their time pursuing esteem and self-actualization, or possibly transcendence. This is not at the exclusion of other needs (that person still needs to maintain their basic needs, eg. eat and sleep), but those drop out of focus.