Foreign Policy decision-making is agreed to be one of the greatest instrument at a state’s disposal to pursue its national interests. It is considered as a full political activity of states. A good Foreign Policy would obviously lead a state in fulfilling its national interests and acquiring rightful place among comity of nations. As such the study of Foreign Policy forms an important part of International Studies. However, the first problem that one faces in the study of Foreign Policy is the problem of definition or clear meaning of the term. When used, it is either out of context or entails a different meaning. As such, it becomes a “neglected concept” as most people dealing with the subject have felt confident that they knew what foreign policy was. This neglect has been one of the most serious obstacles to providing more adequate and comprehensive explanations of Foreign Policy. This article, seeks to provide a comprehensive meaning about the concept of Foreign Policy, and also look into some of the things that determines the foreign policy decision-making of a country. This work, will give many students, researchers and policy makers a good idea of what foreign policy entails and how such policy decisions are being made.