Maslow's hierarchy of needs proposes that humans have five categories of needs that must be met sequentially: physiological needs, safety needs, love and belonging needs, esteem needs, and self-actualization needs. Physiological needs are the most basic for survival, while self-actualization involves achieving one's full potential. Maslow believed lower level needs must be satisfied before progressing to meet higher level needs. The document provides descriptions of each category of needs in Maslow's hierarchy.