Motivation is the driving force behind all human actions and is defined as the willingness to exert effort to achieve organizational goals in order to satisfy individual needs. There are several theories that seek to explain motivation, including: 1) Need theories which propose that people are motivated by inner needs like achievement, power, and affiliation. 2) Process theories that examine the cognitive processes that guide motivation like expectancy theory and equity theory. 3) Reinforcement theories that argue behavior is controlled by external rewards and consequences. 4) Content theories like Maslow's hierarchy of needs and Herzberg's two-factor theory that identify specific needs and factors that motivate employees.