Maslow's Hierarchy of Needs: A theory in psychology proposed by Abraham Maslow in 1943, suggesting that people are motivated by five basic categories of needs - physiological, safety, love/belonging, esteem, and self-actualization.
Herzberg's Two: Factor Theory - A concept that divides workplace factors into two categories - hygiene factors that can cause dissatisfaction if missing but do not necessarily motivate if increased, and motivators that truly encourage employees to work harder.
Expectancy Theory: A theory stating that an individual's motivation is influenced by their expectation of the outcome or reward for their effort and how much they value that outcome