Illinois Summons is a legal document issued by a court to bring an individual to court for an action or suit to be heard by a judge. It is used in civil cases to bring a party to court and compel their attendance. There are two types of Illinois Summons: 1) Summons for Personal Appearance, which is used to notify a defendant of a court hearing and 2) Summons for Service of Process, which is used to notify individuals or entities of a pending action. It is important to note that an Illinois Summons is only effective if served by a properly authorized person in the manner prescribed by law.