Motivation theories try to explain what motivates human behavior. Some key theories discussed in the document include:
1. Maslow's hierarchy of needs proposes that people are motivated to fulfill basic physiological needs first, and then safety, love, esteem and self-actualization needs in turn.
2. McGregor's Theory X and Theory Y describe assumptions about human motivation - Theory X sees people as lazy and undisciplined while Theory Y sees them as creative and wanting responsibility.
3. Herzberg's two-factor theory distinguishes between motivators like achievement and responsibility that improve satisfaction, and hygiene factors like salary and working conditions that prevent dissatisfaction.