The purpose of the Parol evidence rule is To restrict oral evidence from being admitted that supports an agreement in its written form.
The parol evidence rule is a rule in the Anglo-American common law that regulates the types of evidence parties to a contract dispute can submit when attempting to ascertain the precise terms of a contract. The rule also forbids parties who have reduced their agreement to a final written instrument from later bringing other evidence, such the content of oral discussions from earlier in the negotiation process, as proof of a different intent regarding the contract's provisions. A written contract cannot be changed by using extrinsic evidence, according to the rule. The word "parol" comes from the Anglo-Norman French word parol, which means "word of mouth" or "verbal" and was used in the Middle Ages to refer to oral arguments in court cases.
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