This document defines law and discusses different concepts of law. It outlines that law is a system of regulations that governs conduct in a society or nation. There are several concepts of law, including: 1) The historical concept, which views law as evolving over time in relation to social changes. 2) The philosophical concept, which sees law as being based on principles of right and good and aims to promote justice and social good. 3) The sociological concept views law as a product of social needs to serve society. Finally, the document discusses sources of law including natural law, customs, statutes, judicial decisions and constitutions. It also outlines different current legal systems such as civil law and common