- First World: Referred to the United States, its NATO allies, and other countries aligned with Western capitalism and democracy.
- Second World: Denoted the Soviet Union, its allies in the Warsaw Pact, and countries aligned with communism.
- Third World: Was initially used to describe countries that were not aligned with either of these two blocs. These were often newly independent, post-colonial nations in Africa, Asia, and Latin America that sought to maintain neutrality or non-alignment in the Cold War tensions.
New definition need for 4th and sri lanka is the example .