This chapter examines the importance of law and the rule of law by looking at real-life situations through the lens of theoretical models that consider why people obey the law and how judges interpret the law. The chapter considers when and why citizens and elected officials follow the law. It then moves to the conditions under which this obedience of laws falls. It also explores the importance of courts and judges in interpreting the law, and analyses the interaction of politics and law as a way to try to understand how judges come to their decisions. In particular, it looks at the interaction between national and European Union (EU) law.