Maslow's Hierarchy of Needs is a psychological theory developed by Abraham Maslow in the 1940s. It outlines five basic needs that humans must fulfill in order to achieve self-actualization, or the highest level of psychological development. These needs are physiological, safety, love and belonging,
From Wikipedia
Maslow's hierarchy of needs is a conceptualization of the needs that motivate human behaviour, which was proposed by the American psychologist Abraham Maslow.