The full form of GB is “GigaByte“. It is a unit used for digital information. It is a multiple of byte. The prefix giga means 109 in the International System of Units (SI). Therefore, one gigabyte (GB) is one billion bytes. This unit is used in places of science, engineering, business, computing, hard ware devices, tape capacities, and data transmission speed. One byte B consists of 8 bits and is equivalent to the unit of octet. There are many other units like MB and KB which are used to define the limit of data. MB stands for Mega Bytes and KB stands for Kilo Bytes.