The document discusses various theories of motivation. It begins by explaining Maslow's hierarchy of needs theory, which proposes that people are motivated to fulfill basic needs first, and then progress to fulfilling higher-level needs for esteem, belonging, and self-actualization. Next, it summarizes McGregor's Theory X and Theory Y, which describe assumptions about employee motivation and the appropriate management styles. It then provides an overview of Herzberg's two-factor theory of motivation and hygiene factors. The document also briefly explains ERG theory and McClelland's theory of needs focused on achievement, power and affiliation. It concludes with discussing implications of these theories for managers in motivating employees.