Summon is a legal term, which refers to a measure that the judicial organ informs the litigants to appear in court at a specified time and place. According to the provisions of Article 119 of China's Criminal Procedure Law, "A criminal suspect who does not need to be arrested or detained may be summoned to a designated place or residence or unit for interrogation, but the certificate of the people's procuratorate or the public security organ shall be produced.