Just as security issues hold a high priority in international politics, security studies are one of the fundamental fields of study within the discipline of International Relations.

In this context, the book has been prepared by considering the needs of undergraduate and graduate students, as well as researchers interested in the subject of international security. The purpose of the book is to provide the reader with fundamental knowledge about the broad subject of security and to offer insights into the dimensions of security studies.

In this book, the subject of security is addressed across a wide spectrum ranging from etymology to epistemology, and from theory to practice; by including critical studies alongside classical approaches, attention is drawn to the necessity of examining security not only through its outcomes but also through its constitutive and constructive elements.

Important chapters such as Post-Modern Security, Sources of Insecurity in the International Arena, and Methods for Resolving International Security Issues have been added to this book, which is now in its fifth edition. Thus, it is aimed to provide the reader with a reference work that concisely contains everything written and said about security.