One of the most confusing and debated topics internationally which garners so much debate from professors to journalists, journalists, politicians and from politicians to generals, is known as collective security. The idea of ​​collective security has been around for centuries and dates back to the times of the Greeks, however the credit for creating the idea of ​​modern collective security belongs to Woodrow Wilson who coined the theory a couple of years before the start of the First World War. The theory basically forms the concept that each nation's security no longer depends on having to defend itself from attacks but rather utilize the joint security of other nations to deter any signs of aggression that may cause instability between nations. It follows the balance of power theory, but instead of using force to resolve any indifferences, it uses all political actions before the situation gets out of hand and no other member is more important than the other: all for one and one for all (1).““My conception of the League of Nations is just this, that it will operate as an organized moral force of men throughout the world and that whenever or wherever errors and aggressions are planned or contemplated, this inquiring light of conscience will turn against them” (2) In an ideal world, the concept of collective security would be adopted because it would be beneficial to every nation. However, this is not an ideal world, and the theory has been heavily criticized from start to finish. Many believe that if a threat were to occur from outside the party, the theory would be useless, (3) since the state is not bound by any rules and obligations. Another problem consistent with the theory of collective theory is that not all nations can be... in the center of the paper... generality of the system (12), this creates the representation of the group as a global security system an institution lasting and impartial. These seven fundamental aspects are the key to creating a safer world without the fear of terrorism, civil wars or even a world war constantly on our minds. As time passes, old and new threats collide in ever more subtle and public ways. Today we face the threat of terrorism, civil wars, genocide and nuclear wars. As stated earlier, if a threat were to occur from outside a member, collective security theory would be useless, terrorism is one of those external threats. Nations no longer have to deal with another political party to discuss and solve problems with, but rather a small group of people fighting for something they consider to be a just cause, be it ETA, Al-Qaeda or the Taliban..