Illinois Complaint In Forcible Entry and Detained is a legal document filed in the Circuit Court of the county where the property is located by a landlord or property owner to gain possession of a property or evict a tenant. It is a legal action to gain possession of property through a court order. The complaint must be served to the tenant, and the tenant must answer the Complaint within 7 days. The two types of Illinois Complaint In Forcible Entry and Detained are: 1. Forcible Entry: This is when a tenant has entered a property without permission or the consent of the landlord. 2. Detained: This is when a tenant has stayed on the property after the lease has expired or was terminated. In both cases, the landlord must serve the tenant with the Complaint and the tenant must answer the Complaint within 7 days. If the tenant does not answer the Complaint, the landlord can then file a Motion for Judgment for Possession, which will give the landlord possession of the property.