What is the explanation of global stratification that includes core nations semiperiphery nations periphery nations and external areas?

Global stratification refers to the hierarchical arrangement of countries based on their economic development and power. Core nations are highly developed, with strong economies and advanced technologies, often exploiting resources from peripheral nations, which are less developed and rely heavily on agriculture and raw materials. Semiperiphery nations fall between these two extremes, exhibiting characteristics of both core and peripheral nations, often experiencing industrialization and economic growth. External areas may refer to regions that exist outside the global capitalist system, often marginalized and lacking access to global resources and markets.