What is the "mirror image rule" in contract law?

The "mirror image rule" in contract law states that an acceptance must precisely match the terms of the original offer. This principle ensures that the acceptance reflects the offer's content without alterations or deviations. If the acceptance alters any terms or adds new conditions, it is considered a counteroffer rather than an acceptance. This rule promotes clarity and mutual agreement between the parties involved, establishing a clear meeting of the minds necessary for a valid contract. By requiring an exact match, the mirror image rule helps prevent misunderstandings and disputes regarding the terms of an agreement, laying a solid foundation for enforceability in contract law.