1) Unit of information 
The gigabit is a multiple of the unit bit for digital information or computer storage. The prefix giga (symbol G) is defined in the International System of Units (SI) as a multiplier of 109 (1 billion, short scale), and therefore The gigabit has the unit symbol Gbit or Gb. Using the common byte size of 8 bits, 1 Gbit is equal to 125 megabytes (MB)...
1000 megabits [or 1024 megabits depending on who you ask!]
1,000,000,000 (10 9 ) bits
a measure of storage capacity and data transfer equal to 1 billion (10) bits.