Maslow's Hierarchy of Needs is a motivational theory in psychology, proposed by Abraham Maslow in 1943. The theory categorizes human needs into five levels, typically represented in the form of a pyramid. These range from the most basic physiological needs (such as food, water, air, and sleep) at the bottom to self-actualization needs (such as personal growth and creativity) at the top. Maslow argued that individuals must satisfy lower-level needs before progressing to pursue higher-level ones. The five stages include physiological needs, safety needs, love and belonging needs, esteem needs, and self-actualization needs. The theory emphasizes that human behavior is motivated by the drive to fulfill these hierarchical needs. However, Maslow later acknowledged that this hierarchy is not rigid—individuals may pursue multiple needs simultaneously or fluctuate between different levels.