Main Directory Service or name service maps the names of network resources to their respective network addresses. When using a directory service, a user does not have to remember the physical address of a network resource, because providing a name locates the resource. A directory server is a server which provided such a service. Each resource on the network is considered an object by the directory server. Information about a particular resource is stored as a collection of attributes that are associated with that resource or object. In some directory services, this information can be made secure, so that only users with certain permissions, such as administrators, can access it.