A sukuk is an Islamic financial certificate, similar to a bond in Western finance, that complies with Islamic religious law commonly known as Sharia. Since the traditional Western interest-paying bond structure is not permissible, the issuer of a sukuk essentially sells an investor group a certificate, and then uses the proceeds to purchase an asset that the investor group has direct partial ownership interest in. The issuer must also make a contractual promise to buy back the bond at a future date at par value.