North Atlantic Treaty Organization(NATO) was a organization that was formed by some of the European countries and North America. The main reason they formed this organization was so the countries involved wanted a mutual defense so if one of the countries get attack. All the countries that are in this organization will come and help out the country that is being attacked.
The Warsaw Pact was also an organization the was formed by the Soviet Union and their satellite countries. The main reason they formed this organization was to counter the alliance made by the NATO organization. They wanted to have a mutual defense like the organization of NATO. 