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Unilateral contracts are agreements where one party makes a promise in exchange for the performance of a specific act by another party. The crucial aspect of unilateral contracts is that they become enforceable only once the requested action is completed by the performing party.

In this context, the enforcement of a unilateral contract hinges on the fact that the offeror's promise is contingent upon the completion of the act specified in the offer. Until that action is performed, there is no binding agreement, as the offeror is not obligated to fulfill their promise unless the offeree has acted in accordance with the terms of the offer.

By focusing on the completion of the action, it underscores the nature of unilateral contracts where the offer has been made, but it is the performance of the act that finalizes the agreement and makes it enforceable in a legal context. Thus, in a unilateral contract, it is essential that the specified action is completed to establish an enforceable obligation on the part of the offeror.