From the UK government’s Brexit Bill, to China’s territorial claims in the South China Sea, to the Russian invasion of Ukraine, violations of international law have made headlines across the world in recent years. This book offers a comprehensive and accessible guide to the essential rules and facts of international law, explaining what international law is and how it shapes the world around us. Graham and Noortmann provide specific examples to contextualise key concepts in international law, directing readers to a range of further sources to supplement their reading. Topics range from the place of international law in the national legal order, the United Nations and other global international organisations, international human rights, and international environmental law. An essential quick reference text for students and practitioners of international law.