What is a document management system?

Wikipedia defines the term document management as follows: "The term document management (also document management system) refers to the database-supported management of electronic documents. In the German language, it also refers to the management of digitized, originally paper-based documents in electronic systems and is also used as an industry term in a broader sense. The management of paper documents is referred to as document management. For better differentiation, the term electronic document management (EDM) is often used. Document management systems (DMS) are used as software. In English usage, "document management" is more restricted to the management of files with checkin/checkout, versioning and other functions, such as those found in content management systems."