Islamic law or Shariah serves as the foundation for Islamic financial philosophy. Islamic banking is prohibited from engaging in transactions containing interest or riba by Islamic law (an increase stipulated or sought over the principal of a loan or debt). Additionally, Islamic banks are prohibited from engaging in Gharar (uncertainty) or Maiser (gambling) trades. Also, they are prohibited from engaging in any transactions whose subject matter is void (haram practices or industries). Islamic banks place a strong emphasis on making money through investments that adhere to Shariah. According to Islamic law or Shariah, capital gains are correlated with performance. The operations of Islamic banking, which operate within the bounds of Shariah, are centered on sharing potential risk through trading and investment activities using contracts of various kinds and different modes of finance.