French law is unique, with different streams coexisting despite contradictions. The Code Civile of 1804 remains mostly unchanged, but administrative judges create public law. The Constitutional Council judges laws' constitutionality since 1974, with a growing distinction between rules and principles. The 2003 law has accelerated this process. "Introduction to French Law" is a practical book covering various legal fields in detail, written by French juridical scholars. It includes Constitutional Law, European Union Law, Criminal Law, and more. The book serves as a guide for practitioners and a comprehensive survey of French law.