Politics is hugely complex. Some try to reduce its complexity by examining it through an ideological worldview, a one-size-fits-all prescriptive formula or a quantitative examination of as many 'facts' as possible. Yet politics cannot be adequately handled as if it were made of cells and particles: ideological views are oversimplifying and sometimes dangerous. Politics is not simply a moral matter, nor political philosophy a subdivision of moral philosophy. This book is devised as a basic conceptual lexicon for all those who want to understand what politics is, how it works and how it changes or fails to change. Key concepts such as power, conflict, legitimacy and order are clearly defined and their interplay in the state, interstate and global level explored. Principles such as liberty, equality, justice and solidarity are discussed in the context of the political choices confronting us. This compact and systematic introduction to the categories needed to grasp the fundamentals of politics will appeal to readers who want to gain a firmer grasp on the workings of politics, as well as to scholars and students of philosophy, political science and history.