Abraham Maslow created Maslow's hierarchy of needs in 1943 to explain human motivation. The hierarchy consists of physiological needs, safety needs, love and belonging, esteem, and self-actualization. Physiological needs like food, water, shelter, and sleep are most basic for survival. Safety needs include security and protection from harm. Love and belonging involve relationships with friends and family for social interaction. Esteem relates to respect from others and self-respect. Self-actualization is achieving one's full potential. The hierarchy proposes that lower level needs must be satisfied before progressing on to meet higher level growth needs.