A foreign policy is a set of political goals that seeks to outline how a particular country will interact with the other countries of the world.
Foreign policies generally are designed to help protect a country's national interests, national security, ideological goals, and economic prosperity. This can occur as a result of peaceful cooperation with other nations, or through aggression, war, and exploitation.
The 20th century saw a rapid rise in the importance of foreign policy, with virtually every nation in the world now being able to interact with one another in some diplomatic form.
Creating foreign policy is usually the job of the head of government and the foreign minister (or equivalent). However, in the United States, Congress also has considerable power and influence, and is able to pass Foreign Relations Authorization bill's.