Answer Description
Only a domain will give you a centralized, controlled network and allow for file servers, print servers, and network shares. These are possible in a workgroup, but will not provide the network control that a business would require.
Wikipedia
A computer network is a digital telecommunications network for sharing resources between nodes, which are computing devices that use a common telecommunications technology Data transmission between nodes is supported over data links consisting of physical cable media, such as twisted pair or fibre-optic cables, or by wireless methods, such as Wi-Fi, microwave transmission, or free-space optical communication Network nodes are network computer devices that originate, route and terminate data communication They are generally identified by network addresses, and can include hosts such as personal computers, phones, and servers, as well as networking hardware such as routers and switches Two such devices can be said to be networked when one device is able to exchange information with the other device, whether or not they have a direct connection to each other
Computer network - Wikipedia, the free encyclopedia