Security, one of the most important concepts of international relations literature, has under-gone a major transformation due to international security problems that have emerged in the historical process. This situation necessitated the examination of the concept of security in the field of international relations within the framework of international relations theories. This book aims to analyze various security issues experienced in today's world by capitalizing the-oretical approaches within international relations discipline. In this book; certain international issues are discussed which influence the process of international policy.