This document discusses motivation and various theories of work motivation. It begins by defining motivation and discussing the elements and classifications of motives. It then covers several content theories of motivation including Maslow's hierarchy of needs, Herzberg's two-factor theory, and Alderfer's ERG theory. Next, it examines process theories like Vroom's expectancy theory and the Porter-Lawler model. Contemporary theories like equity theory are also introduced. The document provides an overview of key concepts and models regarding what motivates employee performance and satisfaction.