Abraham Maslow developed a hierarchy of needs consisting of 5 levels: physiological needs, safety needs, love and belonging needs, esteem needs, and self-actualization needs. Maslow asserted that lower level needs must be satisfied before higher level needs can be pursued. He studied what motivated human growth and development, focusing on normal human psychology rather than clinical studies. Maslow's hierarchy of needs theory remains influential in business applications and is used in education to support student well-being and development.