TAR: (Tape ARchive) - A compression format commonly used in the transfer and storage of files on UNIX computers (.tar).

T-1: A leased-line connection capable of transferring data at 1,544,000 bps. At maximum capacity, a T-1 line could move a megabyte in less than 10 seconds.

T-3: A leased-line connection capable of transferring data at 44,736,000 bps. This is fast enough to view full-screen, full-motion video, which requires a transfer rate of at least 10,000,000 bits-per-second.

TCP/IP: (Transmission Control Protocol/Internet Protocol) - This is the suite of protocols that defines the Internet. Originally designed for the UNIX operating system, TCP/IP software is not available for every major computer operating system. To connect to the Internet, a computer must have TCP/IP software.

Telnet: An Internet protocol allowing a PC to connect to a host computer and use that computer as if you were locally connected. This often provides the ability to use all the software and capabilities of the host computer.

Terabyte: A thousand (technically 2^10 or 1024) Gigabytes.

Terminal Adapter: An electronic device that interfaces a PC with a host computer via an ISDN phone line. They are often called "ISDN modems"; however, because they are digital, Terminal Adapters are not modems at all.

Terminal Server: A special-purpose computer with places to plug in several modems on one side, and a connection to a LAN or host machine on the other side. The terminal server does the work of passing connections on to the appropriate node. Most terminal servers can provide PPP or SLIP services if connected to the Internet.

Thread: An ongoing message-based conversation on a single subject.

TIFF: (Tag Image File Format) - A popular graphic image file format (.tif).

Trolling: The act of deliberately posting false or inflammatory information in order to start a flame war or cause aggravation to others.