The document defines a leader as a person who influences others towards achieving a goal. It lists several types of leaders including political, union, social, religious, sports, and organizational leaders. The roles of a leader are to achieve the task, develop individuals, and build and maintain the team. A leader differs from a boss in that a leader tells people why and how to do things, relies on goodwill, delegates authority selectively, commands respect, is people-oriented, and believes in "we" rather than "I". Key leadership functions are defining the task, planning, briefing, controlling, motivating, organizing, and providing an example.