Computer communication is the transmission of data and information over a communication channel between two computers.
Communication between computers can be as simple as cabling two computers to the same printer.
Computer network: A computer network is a group of computers, printers, and other devices that are connected together with cables for sharing of data and resources. Information travels over the cables, allowing network users to exchange documents and data with each to the network. Each computer, printer, or other peripheral device that is connected to the network. Each computer, printer, or other peripheral device that is connected to the network is called a node. Networks can have tens, thousands, or even millions of nodes.