Illinois Affidavit For Service by Publication is a legal form used by a person to notify someone of a pending court action, when that person cannot be located. It is used when attempting to serve someone with a summons in a civil court case, and when attempts at direct service have been unsuccessful. It is also referred to as constructive service. There are two types of Illinois Affidavit For Service by Publication: one for service of a summons in a civil court case, and one for service of a summons and complaint in a civil court case. Both forms require the applicant to provide detailed information about the defendant, including name, address, and any other known information. The applicant must also specify the manner in which the defendant should be served, such as by publication of a notice in a newspaper. This affidavit must then be filed with the court, and a copy must be sent to the defendant via the specified method of service. Once the affidavit is approved by the court, it serves as proof of service.