A document issued by the court at the time a lawsuit is filed, stating the name of both plaintiff and defendant, the title and file number of the case, the court and its address, the name and address of the plaintiff’s attorney, and instructions as to the need to file a response to the complaint within a certain time (such as 30 days after service), usually with a form on the back on which information of service of summons and complaint is to be filled out and signed by the process server. A summons differs from a subpoena, which is an order to a witness to appear.