Final answer:
Brain Drain is the migration of highly skilled individuals from developing to developed nations due to better opportunities. An example is medical professionals leaving poorer countries for better prospects in places like the United States or Europe, influenced by the Core-periphery Model of economic and political power distribution.
Step-by-step explanation:
The term Brain Drain refers to the situation where highly skilled and educated individuals leave their home country, often one with fewer opportunities and resources (periphery countries), to seek better prospects in more developed nations (core countries). A common example of brain drain can be observed in the medical field, where professionals from less affluent nations migrate to countries that offer higher wages and advanced career opportunities. This migration is driven by the attractive pull of the core areas, which offer more employment opportunities and political power, compared to the push of lacking opportunities in their home countries.