Islamic banking, Islamic finance, or Sharia-compliant finance is banking or financing activity that complies with Sharia and its practical application through the development of Islamic economics. Some of the modes of Islamic finance include mudarabah, wadiah (safekeeping), musharaka, murabahah (cost-plus), and ijarah (leasing).

Usury is the practice of making loans that are seen as unfairly enriching the lender. The term may be used in a moral sense—condemning taking advantage of others' misfortunes—or in a legal sense, where an interest rate is charged in excess of the maximum rate that is allowed by law. A loan may be considered usurious because of excessive or abusive interest rates or other factors defined by the laws of a state. Someone who practices usury can be called a usurer, but in modern colloquial English may be called a loan shark.