Learn in the textbookTCP/IP and Web Protocols
DefinitionTCP/IP is the family of communication protocols used as the standard on the Internet, combining several protocols with different roles by dividing them into layers (階層).
ExplanationA communication protocol (通信プロトコル) is an agreed set of procedures and formats for exchanging data over a network. TCP/IP is usually described in four layers: the application layer, the transport layer, the Internet layer, and the network interface layer. The two protocols in its name split the core work: TCP delivers data reliably with nothing missing or duplicated, and IP carries it to the destination device based on the IP address.
AnalogyThink of a delivery company where intake, sorting, and transport are handled by separate departments, and each one hands parcels only to the department next to it. If one department changes how it works, the others can carry on as before.
Memory hookThe name joins the two core protocols, TCP and IP, with a slash. Used as the name of the whole family, it also covers many other protocols.