This document provides an introduction to key concepts in comparative politics. It defines politics as decisions made through formal power within a given territory. Government is introduced as the group authorized to make binding public decisions on behalf of a community. Different types of states are outlined such as night watchman, police, and welfare states. Challenges and justifications for government are discussed from thinkers like Hobbes, Rousseau, and Locke. Key factors in nation and state building are also summarized.