Motivation is defined as the internal drive to achieve goals and direct behavior. It arises from the desire to satisfy needs and can be explained by various theories. Maslow's hierarchy of needs proposes that people are motivated to fulfill physiological, safety, social, esteem and self-actualization needs sequentially. McClelland's three need theory identifies the needs for achievement, affiliation and power as key motivators. Herzberg's two-factor theory distinguishes between hygiene factors like working conditions and motivators like achievement that encourage satisfaction and performance.