Illusory offer is an offer or a contract that creates and illusion of imposing obligations upon a party or parties, while actually not imposing anything, thus making such a contract impossible to enforce. For example, a contract that imposes one of the parties to pay a sum of money only if the party is subjectively satisfied with the performance of the other party is an illusory offer, because the party may simply state that it is not satisfied, and thus pay nothing while not violating the contract.