An Illinois Appellant's Reply Brief is a legal document that is filed in response to a respondent's brief in an action or proceeding before an appellate court in the state of Illinois. It is used to provide arguments and evidence to support the appellant's position and refute the respondent's arguments. There are two types of Illinois Appellant's Reply Brief: a general reply brief and an appellant's reply memorandum. In a general reply brief, the appellant responds to all the issues raised by the respondent in their brief and presents their own arguments. In an appellant's reply memorandum, the appellant responds to only a few of the issues raised by the respondent and focuses on those issues most important to the outcome of the case.