Subpoena is a  
writ commanding a person to appear 
under penalty (from the Latin}. It is used to compel the testimony of individuals to a trial. Usually it can be issued by a 
judge or by the 
lawyer representing the 
plaintiff or the 
defendant in a civil 
trial or by the prosecutor or the defnece attorney in a criminal proceeding. The United States Congress also has the power to issue subpoenas and can punish individuals who fail to comply by contempt of Congress, which is similar to 
contempt of court. It has its source in British 
common law and it is now used almost with universal application throughout the Anglo-American common law world.
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