Demonetization refers to the discontinuation of existing currency, introducing new currency to transition to a more cashless economy, which is expected to reduce black money and curb corruption. While it has led to increased online transactions and greater tax compliance, its effectiveness against black money is limited as most is held in physical assets, and it has also caused short-term liquidity issues. The overall impact on the economy is mixed, with potential long-term benefits of increased transparency and reduced counterfeit currency, but immediate challenges for everyday financial activities.