Stands for Transmission Control Protocol. both the protocol and software that ensure that data sent over the Net arrive in the correct order.
TCP/IP
Short for Transmission Control Protocol/Internet Protocol. A group of protocols that specify how computers communicate over the Internet. All computers on the Internet need TCP/IP software.
Telnet
An Internet command that allows your computer to directly connect and interact with remote computers, often through a text-based 'terminal' environment. Often involves the need for passwords and access information.