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A terabit is a multiple of the unit bit for digital information or computer storage. The prefix tera (symbol T) is defined in the International System of Units (SI) as a multiplier of 1012 (1 trillion, short scale), and therefore

1 terabit = 1012bits = 1000000000000bits = 1000 gigabits.

The terabit has the unit symbol Tbit or Tb.

The terabit is closely related to the tebibit, a unit multiple derived from the binary prefix tebi of the same order of magnitude, which is equal to 240bits = 1099511627776bits, or approximately 10% larger than the terabit.

Source: Wikipedia