Martial law\xa0is the imposition of the highest-ranking military officer as the military\xa0governor\xa0or as the\xa0head of the government, thus removing all power from the previous executive, legislative, and judicial branches of government.It is usually imposed temporarily when the government or civilian authorities fail to function effectively.

When in a country or in a state the conditions become severe which cannot be controlled by state police or normal administration then at that place military control come.
Martial law is referred to as a system of rules that comes into effect when a military authority has the power to take control of the normal administration of justice.
Law which not allowed the people to gather at one place