Political philosophy is the study of fundamental questions about the state, government, politics, liberty, justice and the enforcement of a legal code by authority. It is Ethics applied to a group of people, and discusses how a society should be set up and how one should act within a society. Individual rights (such as the right to life, liberty, property, the pursuit of happiness, free speech, self-defense, etc) state explicitly the requirements for a person to benefit rather than suffer from living in a society.
Political philosophy asks questions like: "What is a government?", "Why are governments needed?", "What makes a government legitimate?", "What rights and freedoms should a government protect?", "What duties do citizens owe to a legitimate government, if any?" and "When may a government be legitimately overthrown, if ever?"