A civil case begins when a person or entity (such as a corporation or the government), called the plaintiff, claims that another person or entity (the defendant) has failed to carry out a legal duty owed to the plaintiff. Both the plaintiff and the defendant are also referred to as "parties" or "litigants." The plaintiff may ask the court to tell the defendant to fulfill the duty, or make compensation for the harm done, or both. Legal duties include respecting rights established under the Constitution or under federal or state law.
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