Each dataverse hosted by a Dataverse Network is a virtual archive or organizer of research data. It can contain data sets (called studies) that are uploaded specifically to that dataverse or that belong to other dataverses. Data sets can be organized by collections and sub-collections. In addition to uploading studies and setting up collections, if you are the dataverse owner (administrator) you can customize the dataverse browser page.
See topic: The Dataverse Network Project