Workgroup– It is a logical grouping of computers. Also called peer-to-peer, is a small group of computers, often ten or less, to share same network name. No one computer controls the network, and all systems are considered equal.
Domain – It is a logical grouping of computers. In it one or more computers have control of network so, centralized administration. They have name and called as client/server networks.
Computer network name is changed in System Properties window, also the name of the workgroup, joining new workgroups, or joining domains can be done.