In a domain, one or more computer can be a server to manage the network. On the other hand in a orkgroup all computers are peers having no control on each other. In a domain.
user doesn’t need an account to logon on a specific computer if an account is available on the domain. In a work group user needs to have an account for every computer.
In a domain, Computers can be o n different local networks. In a work group all computers needs to be a part of the same local network.