Illinois Class 7A application is a process used to register a business entity in the state of Illinois. The application is used by business owners who want to establish their business as a corporation, limited liability company (LLC), limited partnership (LP), or limited liability partnership (LLP). The application requires the submission of documents such as Articles of Incorporation and a Certificate of Good Standing, as well as other forms and fees. Upon approval, the entity is registered with the Secretary of State. There are three types of Illinois Class 7A applications: the Corporation Application, the Limited Liability Company Application, and the Limited Partnership/Limited Liability Partnership Application. Each application requires a different set of documents and fees to be submitted.