This document discusses power, authority, and legitimacy. It defines power as the ability to influence others and achieve objectives, and identifies six reasons why power is important for governments. Authority is defined as legitimate power assigned to a position, and there are three main sources of authority: traditional, charismatic, and legal-rational. Legitimacy means having the right to rule based on established rules and the consent of the governed. Governments can achieve legitimacy through long-standing governance, just rule, national symbols, and structure.