In physics, energy is an indirectly observed quantity. It is often understood as the ability a physical system has to do work on other physical systems...
to cut off food, supplies, war material or communications from a particular area by force, either in part or totally. A blockade should not be confused with an embargo
An embargo is the partial or complete prohibition of commerce and trade with a particular country, in order to isolate it. Embargoes are considered strong diplomatic measures imposed in an effort, by the imposing country, to elicit a given national-interest result from the country on which it is...
International sanctions are actions taken by countries against others for political reasons, either unilaterally or multilaterally.There are several types of sanctions....
, which are legal barriers to trade, and is distinct from a siege
A siege is a military blockade of a city or fortress with the intent of conquering by attrition or assault. The term derives from sedere, Latin for "to sit". Generally speaking, siege warfare is a form of constant, low intensity conflict characterized by one party holding a strong, static...
in that a blockade is usually directed at an entire country or region, rather than a fortress or city. Most blockades historically took place at sea, with the blockading power seeking to cut off all maritime transport from and to the blockaded country; although stopping all land transport to and from an area may also be considered a blockade.