TCP and TCP/IP are both Communication protocols. TCP/IP is also known as Internet protocol suite. TCP and IP together forms Internet Protocol suite. TCP is transmission control protocol responsible for the reliable delivery of the packets or datagram and IP is internet protocol is responsible for logical addressing.
TCP--Transmission Control Protocol
IP-Internet Protocol
TCP/IP suite is used for communication.
TCP is process to process communication
and
IP is host to host Communication(i.e point to point)
which implies that IP will carry data from host to host
EX:from gmail server to yahoo server
but how it is to be transfered upto mail window from the server where IP left is job of TCP.