The GigabitGigabit The Gigabit is the unit of measurement that represents 1 billion bits and is abbreviated as Gbit or Gb. This unit of measurement is often used, together with the megabit and the kilobit, in relation to time (in seconds) for calculating the transmission speed of digital signals, mainly used to calculate the speed of a data download. The Gbit/s is currently a widely used unit of measurement to refer to data transmission speed in computer networks. is the unit of measurement that represents 1 billion bits and is abbreviated as Gbit or Gb. This unit of measurement is often used, together with the megabitMegabit A unit of measurement equal to one million bits, used to specify the transmission speed of computer networks: Mb per second (Mb/s). Not to be confused with a Megabyte (MB), one million bytes, each consisting of 8 bits. A Megabyte is eight times larger than a Megabit. It takes 8 seconds to transmit 1 Megabyte at a speed of 1 Megabit. and the kilobit, in relation to time (in seconds) for calculating the transmission speed of digital signals, mainly used to calculate the speed of a data downloadDownload The action of downloading or retrieving data from the network.. The Gbit/s is currently a widely used unit of measurement to refer to data transmission speed in computer networks.