Gigabyte
A gigabyte is a unit of information or computer storage meaning either exactly 1 billion bytes.
The usage of the word "gigabyte" is ambiguous: the value depends on the context. When referring to RAM sizes and file sizes, it traditionally has a binary definition, of 1073,741,824 bytes. For general definitional purposes, it means exactly 1000,000,000 bytes.
It is commonly abbreviated GB or Gbyte (not to be confused with Gb, which is used for a gigabit).