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Demonetization is the act of stripping a currency unit of its status as legal tender. It occurs whenever there is a change of national currency: The current form or forms of money is or are pulled from circulation and retired, often to be replaced with new notes or coins.

A famous example of demonetization occurred in 2016 when India demonetized 86% of its nation's currency.
Demonetization: Meaning, Example, and How It Works https://www.investopedia.com/terms/d/demonetization.asp