The parol evidence rule says that a party can vary the terms of a written contract by introducing evidence of terms allegedly agreed on prior to, or contemporaneous with writing.

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The parol evidence rule generally prohibits parties from introducing prior or contemporaneous oral or written agreements that would alter or contradict the terms of a written contract. The written contract is considered the final expression of the parties' agreement. There are some exceptions to the rule, such as evidence that helps interpret ambiguous language or evidence of fraud, duress, mistake or illegality.

The Parol Evidence Rule Says That a Party Can Vary