TCP IP
A suite of communications
protocols that defines the basic workings of the
Internet . In fact TCP/IP is THE protocol of the Internet because it's the language by which all Internet computers talk to each other. 
Protocol Suite. Transmission Control Protocol over Internet Protocol. Common shorthand which refers to the suite of transport and application protocols which runs over IP. See also: IP, ICMP, TCP, UDP, FTP, Telnet, SMTP, SNMP.