The term 'third world' originally referred to countries that were not aligned with either the Western bloc (led by the United States and its allies) or the Eastern bloc (led by the Soviet Union) during the Cold War. Over time, it became commonly used to describe countries with lower economic development, often in Africa, Latin America, and Asia. The term is now considered outdated and potentially pejorative, with 'developing countries' or 'Global South' being preferred alternatives.
