Motivation is defined as the complex set of forces that cause people to engage in goal-directed behaviors. The document summarizes several major theories of motivation: [1] Maslow's hierarchy of needs proposes that people are motivated to fulfill basic physiological needs, safety needs, belongingness needs, esteem needs, and self-actualization needs sequentially. [2] Herzberg's two-factor theory distinguishes between motivators like achievement that provide job satisfaction and hygiene factors like salary that prevent dissatisfaction. [3] Vroom's expectancy theory suggests that motivation depends on expectations of achieving desired outcomes through effort. The document also discusses McGregor's Theory X and Y of