A terabyte is 1 trillion bytes. To be precise, it's actually 1,009,511,627,776 bytes, (or 2 raised to the 40th power).
TCP/IP (Transmission Control Protocol/Internet Protocol)
A standard used for transmitting data over the Internet. TCP and IP are actually 2 different standards, but they are used together. TCP/IP is the most widely accepted standard for transmitting data between computers.
TIFF (Tagged Image File Format)
An image file format that stores bit-mapped images. The format supports any resolution or color scheme. These files usually have the ".tif" extension. They are compatible with both PC and Macintosh computers.
TWAIN (Technology Without An Interesting Name)
This is the standard used for scanners and digital imaging devices. A TWAIN driver is normally included with a scanner, webcam, digital camera, or other digital imaging device.