An Islamic bank is a deposit-taking banking institution whose scope of activities includes all currently known banking activities, excluding borrowing and lending on the basis of interest. On the liabilities side, it mobilizes funds on the basis of a Mudarabah or Wakalah (agent) contract. It can also accept demand deposits which are treated as interest-free loans from the clients to the bank. and which are guaranteed. On the assets side, it advances funds on a profit-and–loss sharing or a debt-creating basis, in accordance with the principles of the Shar?ah.
It plays the role of an investment manager for the owners of time deposits, usually called investment deposits. In addition, equity holding as well as commodity and asset trading constitute an integral part of Islamic banking operations.
An Islamic bank shares its net earnings with its depositors in a way that depends on the size and date-to-maturity of each deposit. Depositors must be informed beforehand of the formula used for sharing the net earnings with the bank.