A server is designed to manage network resources and provide various services to other computers on the network, such as hosting a website, managing email, or storing files. Workstations are powerful computers designed for technical or scientific applications, not primarily focused on providing network services. A router is a device that forwards data packets along networks but does not manage network resources. A NAS device is specialized for data storage and sharing within a network, but it does not perform the wide range of services that a server can provide.