Maslow's hierarchy of needs divides human needs into five levels, with the lowest levels focusing on physiological and safety needs that must be met before higher-level needs for love, esteem, and self-actualization can be pursued. The bottom levels include basic survival needs, security, and social relationships. Once these are satisfied, esteem and feelings of self-worth become important, with self-actualization representing the highest level of fulfilling one's full potential and continuing personal growth.