Motivation accounts for an individual's effort, direction, and persistence towards goals. There are three aspects of motivation: effort, direction, and persistence. Motivation theories are classified into content/need theories, which examine what motivates behavior, and process theories, which examine how content influences behavior. Key content theories include Maslow's hierarchy of needs, Herzberg's two-factor theory, and Alderfer's ERG theory. Process theories include Vroom's expectancy theory and equity theory. Motivation is important for productivity, change management, resource utilization, satisfaction, and goal achievement in organizations.