An Illinois Petition for Dissolution is a document used to file for a divorce in the state of Illinois. There are two types of Illinois Petition for Dissolution: a joint petition, which is filed by both spouses, and a unilateral petition, which is filed by one spouse. The petition contains information such as the names of both spouses, their addresses, the date of marriage, the grounds for dissolution, and a request for spousal support or division of assets. The petition must be accompanied by a financial affidavit, which provides financial information about each spouse. Once the petition is filed, the court will assign a case number and issue a summons, requiring both spouses to appear at a hearing. After the hearing, the court will issue a judgment of dissolution, which officially terminates the marriage.