Based on some references that I read the TCP / IP (Transmission Control Protocol / Internet Protocol) is the basic language of communication the Internet or Internet protocol. But although the term is associated with the Internet does not mean only used for internet connection only, but this protocol can also be applied in a computer network that is not connected to the Internet (intranet).
TCP / IP itself is two things (two layers) are interrelated. TCP is part of the processing / conversion of data from client computers request data into several parts and send the pieces through to the destination IP and TCP received from another computer that combines the parts back into a full data package in accordance with request from the client computer.