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In general use, a complaint is an expression of displeasure, such as poor service at a store, or from a local government, etc. Under common law, a complaint is a formal legal document that sets out the basic facts and legal reasons (see: cause of action) that the filing party (the plaintiffs) believes are sufficient to support a claim against another person, persons, entity or entities (the defendants) that entitles the plaintiff(s) to a remedy (either money damages or injunctive relief).