macOS Server
Operating system
DescriptionmacOS Server is a product formerly called Mac OS X Server and OS X Server. Mac OS X Server was a stand-alone operating system whereas macOS Server is sold as an operating system add-on that provides additional server programs along with management and administration tools for iOS and macOS.
Network-attached storage
DescriptionNetwork-attached storage is a file-level computer data storage server connected to a computer network providing data access to a heterogeneous group of clients. NAS is specialized for serving files either by its hardware, software, or configuration.