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Literally speaking, brain drain is the draining of the brains. People who are educated here go in search of the Promised Land to earn their living. They leave their hometowns and go abroad. The main reason being, they get to earn more money and there are plenty of opportunities out there. Once they settle there and become accustomed and adapt themselves to the style of living there, they find it difficult to come back to their home town. So more and more people keep moving day by day, year by year.