Definition: One of three fundamental prohibitions in Islamic finance (the other two being riba and maysir). Gharar is a sophisticated concept that covers certain types of haram uncertainty in a contract. It is an exchange in which one or more parties stand to be deceived through ignorance of an essential element of the exchange. Gambling is a form of gharar because the gambler is ignorant of the result of the gamble. The prohibition on gharar is often used as the grounds for criticism of conventional financial practices such as short selling, speculation and derivatives.