Riba (Interest or Usury) refers to the exploitative practice of charging interest on loans or any transaction where money is exchanged for an unequal amount of money. In Islam, Riba is strictly forbidden (Haram) and is considered one of the most destructive sins. The Quran contains a fierce warning against those who engage in Riba, as it leads to social inequality, the concentration of wealth in a few hands, and the exploitation of the poor. Islam promotes a "Real Economy" based on trade, risk-sharing, and ethical investment (like Murabaha and Musharakah) rather than the "Debt Economy" driven by Riba.