An eDMS, as its name already reveals, is an electronic system to manage documents. Whether these documents belong to the Quality Management System, the product development, human resources, legal or any other sort of document is irrelevant. Modern eDMS support all kinds of document file types, whether it is a Microsoft Word, PDF, 3D Drawing, pictures, or other, it all can be stored in the eDMS.
Further, eDMS usually come with some sort of functionality as versioning, archiving, approval workflows, and categorization, to name a few.