This document provides an overview of several theories of motivation. It begins by defining motivation and its key elements. It then discusses early theories proposed by Maslow, McGregor, and Herzberg. Maslow's hierarchy of needs proposes that lower level needs must be satisfied before higher needs. McGregor's Theory X and Y describe negative and positive views of human nature. Herzberg's two-factor theory distinguishes between motivators and hygiene factors. The document also covers McClelland's need theory and contemporary theories like self-determination theory, which examines intrinsic versus extrinsic motivation. Self-determination theory suggests rewards can enhance or undermine motivation depending on whether they are seen as informational or controlling.