A Delaware Certificate of Formation of a Limited Liability Company (LLC) is a legal document filed with the Delaware Secretary of State to officially create a Delaware LLC. The Certificate of Formation is the official document that establishes the existence of the LLC and outlines the basic information about the LLC such as its name, address, purpose, and duration. The two types of Delaware Certificate of Formation of a Limited Liability Company are the Standard Certificate of Formation and the Professional LLC Certificate of Formation. The Standard Certificate of Formation is used to form a standard LLC with more than one member. The Professional LLC Certificate of Formation is used to form a professional LLC and must be signed by a licensed professional.