Law is commonly understood as a system of rules that are created and enforced through social or governmental institutions to regulate conduct, although its precise definition is a matter of longstanding debate. It has been variously described as a science and the art of justice. There are six (6) main functions of laws in a country. They are to keep the peace in a country, shaping moral standards, promoting social justice, facilitating orderly change, providing a basis for compromise and lastly to help in facilitating a plan. Besides that there are two (2) types of law. 

Each has its own system of laws and courts that handle:

Criminal matters. Divorce and family matters. Welfare, public assistance or Medicaid matters. Wills, inheritances and estates. Real estate and other property. Business contracts. Personal injuries such as from a car accident or medical malpractice.

The law serves many purposes. Four principal ones are establishing standards, maintaining order, resolving disputes, and protecting liberties and rights. Martial law is the imposition of direct military control of normal civil functions or suspension of civil law by a government, especially in response to a temporary emergency where civil forces are overwhelmed, or in an occupied territory.