What is the Theory of Needs (Achievement, Power, Affiliation)?

This video describes the Theory of Needs. Under this theory, individuals are motivated to work by three psychological needs: achievement, power, and motivation. Individuals who are primarily motivated by achievement like moderate risk/reward tasks. They like to work with other individuals motivated by achievement. Individuals who are primarily motivated by power tend to seek leadership positions. There are two types of power: institutional (social) and personal. Generally, individuals who are primarily motivated by institutional power tend to be more successful than those motivated by personal power. Individuals who are primarily motivated by affiliation like low risk/reward tasks and like socializing. Most individuals are motivated by a combination of all three motivators.