Is there consideration in a unilateral contract?

In a unilateral contract, consideration is present, but it operates differently than in a bilateral contract. The offeror provides consideration by promising something (e.g., payment) in exchange for the performance of a specific act by the offeree. The offeree's act constitutes the consideration that completes the contract. Thus, while only one party makes a promise initially, the consideration comes into effect once the act is performed.